Genghis Khan was not Muslim nor Christain. Genghis Khan was Animist(Shaman - a Tantrik like culture which a part of Hinduism). He defeated many Muslim and Christain Kingdoms. There are Animist even in Hindu Culture in North eastern Indian states so indirectly even Genghis Khan is a Hindu. Animist is like Tantric culture. Grandsons of Genghis Khan were converted to Buddhist, Christains and Muslim. Whereas some of the Grandsons generations are still Animist those living in Mongolia. There are many Buddhist Khans, Tao Khans, Confuscian Khans, Christain Khans of Russia, Animist Khans of Mongolia and Muslim Khans.

Genghis Khan defeated Muslim
By 1218, the Mongol Empire extended as far west as Lake Balkhash, which bordored the Khwarezmia, a Muslim state that reached to the Caspian Sea in the west and Persian Gulf and the Arabian Sea in the south.

Invasion of Khwarezmid Empire

/wiki/Image:Khwarezmid_empire.png /wiki/Image:Minaret_in_Samarkand.jpgA minaret in Samarkand .
According to stories, Khan diverted a river of Ala ad-Din Muhammad II of Khwarezm's birthplace, erasing it from the map. The Mongols' conquest of the capital was nothing short of brutal: the bodies of citizens and soldiers filled the trenches surrounding the city, allowing the Mongols to enter raping, pillaging and plundering homes and temples.
In the end, the Shah fled rather than surrender. Genghis Khan charged Subutai and Jebe with hunting him down, giving them two years and 20,000 men. The Shah died under mysterious circumstances on a small island within his empire.
By 1220 the Khwarezmid Empire was eradicated. After Samarkand fell, Bukhara became the capital of Jorezm, while two Mongol generals advanced on other cities to the north and the south. Jorezm, the heir of Shah Jalal Al-Din and a brilliant strategist, who was supported enough by the town, battled the Mongols several times with his father's armies. However, internal disputes once again split his forces apart, and Jorezm was forced to flee Bukhara after a devastating defeat.
Genghis Khan selected his third son Ögedei as his successor before his army set out, and specified that subsequent Khans should be his direct descendants. Genghis Khan also left Muqali, one of his most trusted generals, as the supreme commander of all Mongol forces in Jin China .

http://en.wikipedia.org/wiki/Genghis_khan

http://en.wikipedia.org/wiki/Mongol_invasion_of_Central_Asia


Genghis Khan marched into Afghanistan to attack Jalal Al-Din son of Ala ad-Din Muhammad II Muslim king of Khwarezm Empire. Genghis Khan never attacked Hindus. Inspite of knowing about India he never entered main India.

The Khurasan Campaign

As the Mongols battered their way into Urgench, Genghis dispatched his youngest son Tolui, at the head of an army, into the western Khwarezmid province of Khurasan . Khurasan had already felt the strength of Mongol arms. Earlier in the war, the generals Jebe and Subatai had travelled through the province while hunting down the fleeing Shah. However, the region was far from subjugated, many major cities remained free of Mongol rule, and the region was rife with rebellion against the few Mongol forces present in the region after the rumors of Jalal Al-Din gathering an army to fight against the Mongols. Tolui's army consisted of somewhere around 50,000 men, which was comprised of a core of Mongol soldiers (some estimates place it at 7,000[8]), supplemented by a large body of foreign soldiers, such as Turks and previously conquered peoples in China and Mongolia . The army also included "3,000 machines flinging heavy incendiary arrows, 300 catapults, 700 mongonels to discharge pots filled with naphtha, 4,000 storming-ladders, and 2,500 sacks of earth for filling up moats."[5] The major city to fall to Tolui's army was the city of Merv. Juvayni wrote of Merv: "In extent of territory it excelled among the lands of Khurasan, and the bird of peace and security flew over its confines. The number of its chief men rivaled the drops of April rain, and its earth contended with the heavens."[8]
The garrison at Merv was only about 12,000 men, and the city was inundated with refugees from eastern Khwarezmid. For six days, Tolui sieged the city, and on the seventh day, he assaulted the city. However, the garrison beat back the assault and launched their own counter-attack against the Mongols. The garrison force was similarly forced back into the city. The next day, the city's governor surrendered the city on Tolui's promise that the lives of the citizens would be spared. As soon as the city was handed over, however, Tolui reneged on his promise and slaughtered almost every person who surrendered. After finishing off Merv, Tolui headed westwards, attacking the cities of Nishapur and Herat. Nishapur fell after only three days and Tolui put every living thing in city, including the cats and dogs, to the sword[8]. After Nishapur's fall, Herat surrendered without a fight. By spring 1221, the province of Khurasan was under complete Mongol rule. Leaving garrison forces behind him, Tolui headed back east to rejoin his father.

The Final Campaign and Aftermath

After the Mongol campaign in Khurasan, the majority of the Shah's army was broken. Jalal Al-Din, who took power after his father's death, began assembling the remnants of the Khwarezmid army in the south, in the area of Afghanistan. Genghis had dispatched forces to hunt down the gathering army under Jalal Al-Din, and the two sides met in the spring of 1221 at the town of Parwan. The engagement was a humiliating defeat for the Mongol forces. Enraged, Genghis headed south himself, and defeated Jalal Al-Din on the Indus River. Jalal Al-Din, defeated, fled to India . Genghis spent some time on the southern shore of the Indus searching for the new Shah, but failed to find him. Khan returned northwards, content to leave the Shah in India .
After the remaining centers of resistance were destroyed, Genghis returned to Mongolia , leaving Mongolian garrison troops behind. The destruction and absorption of the Khwarezmid Empire would prove to be a sign of things to come for the Islamic world, as well as Eastern Europe .[7] The new territory proved to be an important stepping stone for Mongol armies under the reign of Genghis' son Ögedei to invade Russia and Poland, and future campaigns brought Mongol arms to Austria, the Baltic Sea and Germany. For the Islamic world, the destruction of Khwarezmid left Iraq, Turkey and Syria wide open. All three were eventually subjugated by future Khans.
The war with Khwarezmid also brought up the important question of succession. Genghis was not young when the war began, and he had four sons, all of whom were fierce warriors and each with their own loyal followers. Such sibling rivalry almost came to a head during the siege of Urgench, and Genghis was forced to rely on his third son, Ögedei, to finish the battle. Following the destruction of Urgench, Genghis officially selected Ögedei to be successor, as well as establishing that future Khans would come from direct descendants of previous rulers. Despite this establishment, the four sons would eventually come to blows, and those blows showed the instability of the Khanate that Genghis had created.
Jochi never forgave his father, and essentially withdrew from further Mongol wars, into the north, where he refused to come to his father .[1] - indeed, at the time of his death, the Khan was contemplating a march on his rebellious son. While Jochi acknowledged officially the rule of Ögedei, he never accepted it literally, and that bitterness, transmitted to his sons, and especially grandsons, Batu and Berke Khan, (of the Golden Horde) who would conquer Kiev Rus, and the Russian States , brought open warfare to the empire, and it's fall.[6] When the Mamluks of Egypt managed to inflict one of history's more significant defeats on the Mongols at Ain Jalut in 1260, Hulegu Khan, one of Genghis Khan's grandsons by his son Tolui, who had sacked Bagdad in 1258, was unable to avenge that defeat when Berke Khan, his cousin, (who had converted to Islam) attacked him in the Transcaucus to aid the cause of Islam, and Mongol battled Mongol for the first time. The seeds of that battle began in the war with Khwarezmid when their fathers struggled for supremacy.[7]

http://en.wikipedia.org/wiki/Mongol_invasion_of_Central_Asia

Genghis Khan attacks Christain Empire on Georgia

http://en.wikipedia.org/wiki/Mongol_invasions_of_Georgia
In a letter of Queen Rusudan wrote to Pope Honorious III she mentions that they thought that Mongols as actually the ememies of Muslim hence Mongols were christains but they came to know that Mongols were not Muslims nor Christains they were actually Pagan(Idol worshipper) as Mongols were Animist the religion practiced in North eastern states of India, Bengal and to some extent even in south India similar to Tantric culture.

"Queen Rusudan wrote in her letter to Pope Honorius III, that the Georgians had thought of their unexpected foe to be Christians because they fought Muslims, but they had turned out to be pagans."

The Mongols made their first appearance in the Georgian possessions when this latter kingdom was still in its zenith, dominating most of the Caucasus. It occurred early in the fall of 1220, when approximately 20,000 Mongols led by Subedei and Jebe pursued the ousted Shah Muhammad II of Khwarezmia to the Caspian Sea. With the consent of Genghis Khan, the two Mongol generals proceeded west on a reconnaissance mission. They thrust into Armenia, then under the Georgian authority, and defeated some 60,000 Georgians and Armenians commanded by King George IV “Lasha” of Georgia and his atabek (tutor) and spasalar (commander-in-chief) Iwane Mkhargrdzeli (also known as Zak’arean or Zak’arid in Armenian history writing) at the Battle of Khunan on the Kotman River. George was severely wounded in the chest. The Mongol commanders, however, were not inclined to conquer the Caucasus at that time and turned back south to Hamadan, only to return in force in January 1221. The battle at Bardav (Pardav; modern-day Barda, Azerbaijan) was indecisive and the invaders withdrew to the Caspian Sea. Then the Mongols marched to the north plundering northeastern Armenia and Shirvan enroute. This took them through the Caucasus into Alania and the South Russian steppes where the Mongols routed the Rus’-Kipchak armies at the Battle of the Kalka River (1223).
These surprise attacks left the Georgians in confusion. The contemporary chronicler is unaware of the nature of the attackers and does not mention them by name. Two years later, in 1223, when the Mongols had seemingly deferred their plans regarding Georgia, King George IV’s sister and successor Queen Rusudan wrote in her letter to Pope Honorius III, that the Georgians had thought of their unexpected foe to be Christians because they fought Muslims, but they had turned out to be pagans.
Mongol conquest of Georgia
The third and final invasion of the Caucasus by the Mongols took place in 1236. This offensive, which would prove the ruin of Georgia, was preceded by the devastating conflict with Jalal ad-Din Mingburnu, a refugee shah of Khwarezmia, who had vainly demanded from the Georgian government, in 1225, to support his war against the Mongols. The ensuing Khwarezmian attack destroyed much of the former strength and prosperity of the Kingdom of Georgia, leaving the country largely defenseless in the face of the forthcoming Mongol conquests.
After the death of Mingburnu in 1231, the Mongols’ hands were finally free and the prominent Mongol commander Chormaqan led, in 1236, a large army against Georgia and its vassal Armenian princedoms. Most of the Georgian and Armenian nobles, who held military posts along the frontier regions submitted without any serious opposition or confined their resistance to their castles while others preferred to flee to safer areas. Queen Rusudan had to evacuate Tbilisi for Kutaisi, leaving eastern Georgia in the hands of atabek Avag Mkhargrdzeli and Egarslan Bakurtsikheli, who made peace with the Mongols and agreed to pay them tribute. The only Georgian great noble to have resisted was Iwane Jakeli-Tsikhisjvreli, prince of Samtskhe. His extensive possessions were fearfully devastated, and Iwane had to finally, with the consent of Queen Rusudan, submit to the invaders in 1238. The Mongol armies chose not to cross the Likhi Range in pursuit of the Georgian queen, leaving western Georgia relatively spared of the rampages. Rusudan attempted to gain support from Pope Gregory IX, but without any success. Atabek Avag arranged her submission in 1243, and Georgia officially acknowledged the Great Khan as its overlord. The country was forced to pay an annual tribute of 50,000 gold pieces and support the Mongols with an army.

But Georgia again roused back with the help of it’s king George V “The Brilliant” during the descendents of Genghis khan.


Grand son’s of Genghis Khan from his fourth son Touli.

Möngke Khan. He was the elder brother of Hulagu Khan. His mother was a Nestorian Christain. Mongke khan (1208-1259, also transliterated as Mongke, Mongka, Möngka, Mangu) was the fourth Great Khan of the Mongol Empire from 1251 to 1259. He was the son of Tolui and Sorghaghtani Beki, brother of Hulagu, and a grandson of Genghis Khan.
Möngke is noted as participating in the European campaign of 1236-1242, in the campaign against the steppe peoples to the southeast of the Russian principalities, the destruction of Kiev, and the assault of Hungary. In the summer of 1241, before the premature end of the campaign, Möngke returned home. He was who was said to be favourable to Nestorian Christianity

Kublai Khan, Khubilai Khan. His mother was Nestorian Christain. He adopted Buddhism. Kublai Khan. or "the last of the Great Khans" (September 23, 1215 - February 18, 1294) (Mongolian: Хубилай хаан, Chinese: 忽必烈汗; pinyin: Hūbìliè Hàn), was a Mongol military leader. He was the fifth Khagan (1260–1294) of the Mongol Empire as well as the founder and the first Emperor (1271–1294) of the Chinese Yuan Dynasty.
Born the second son of Tolui and Sorghaghtani Beki and the grandson of Genghis Khan, he succeeded his older brother Möngke in 1260. Kublai Khan's brother, Hulagu, conquered Persia and founded the Ilkhanate. Kublai also had a cousin named Kaidu, who died in 1301.



Hulagu Khan (also known as Hülegü, and Hulegu). His mother was a Nestorian Christain. His wife was a christain but he was not a christain. (1217 – 8 February 1265) was a Mongol ruler who conquered much of Southwest Asia. The grandson of Genghis Khan and the brother of Arik Boke, Mongke and Kublai Khan, he became the first khan of the Ilkhanate of Persia. His mother was Nestorian Christian. He was The founder of the Ilkhanate dynasty. He defeated the Muslim Empire of Baghdad. His brother Khubilai adopted Buddhism.
http://en.wikipedia.org/wiki/Hulagu_Khan

Ariq Boke or Arigh Bukha
Was compassionate towards christanity.

http://en.wikipedia.org/wiki/Ariq_Boke

Grandsons of Genghis Khan from his first son Jochi.

Berke Khan cousin of Hulagu Khan. Berke Khan adopted Islam.
His mother was Muslim. Berke Khan was the Khan of the Kipchak or Blue Horde from 1257 to 1266. He suceeded his brother Batu Khan and was responsible of the first "official establishment" of Islam in a Mongol state[1] and came to the aid of the Mamlukes in defence of the Holy Land in the Battle of Ain Jalut against another another Mongol state, the Ilkhanate. His Khanate was called Kipchak Khanate though it was founded by his elder brother Batu Khan(the founder of blue horde).

http://en.wikipedia.org/wiki/Berke

Batu Khan elder brother of Berke Khan. Batu Khan was the founder of Blue Horde. Batu Khan. His mother was Muslim. (Russian: Баты́й, Ukrainian: Батий) (c. 1205 - 1255) was a Mongol ruler and the founder of the Blue Horde. Batu was a son of Jochi and grandson of Genghis Khan. His Blue Horde became the Golden Horde (or Kipchak Khanate), which ruled Russia for around 250 years, after also destroying the armies of Poland and Hungary.

Orda Khan was the elder brother of Batu Khan and Berke Khan. Orda Khan was the founder of White Horde. His empire was later on merged with Batu Khan’s Blue Horde and was ruled by Berke Khan as Golden Horde. His mother was Muslim.
Orda was a Mongol khan, the eldest grandson of Genghis Khan, son of Jöchi and the founder of White Horde. Orda was known to have participated in the massive Mongol invasion of Rus in 1237-1242.

Grandsons of Genghis Khan from his third son

Güyük khan son of Ögedei Khan, Grandson of Genghis Khan from his second son. Ögedite Khanate/

Kaidu was the son of Guyuk Khan. Kaidu was muslim. Formed Ögedei Khanate.

http://en.wikipedia.org/wiki/Kaidu

Grandson of Genghis Khan from his second son.

Son of Chagatai Khan was Yesü Möngke

http://en.wikipedia.org/wiki/Yes%C3%BC_M%C3%B6ngke

Qara Hülëgü (d. 1252) was head of the ulus of the Chagatai Khanate (1242 - 1246, 1252). He was the son of Mö'etüken, and a grandson of Chagatai Khan.

Grandson of Chagatai Khan was Alghu who founded Chagatai Khanate.

Alghu was suceeded by Baraq.

Baraq was succeeded by Duwa.