I believe that Brahman is all that exists. When I say all, I mean more than just what you see, touch, taste, smell, and hear. You can feel Brahman. God is both spiritual and physical. Even concepts that are discovered by humans through science, mathematics, and philosophy are all part of God. I think that science is a path of learning more about God and how Brahman's creation works.
I don't believe that Brahman is one, two, three, or zero, but infinity. Or maybe Brahman is all of that! Everything is a part of Brahman including people. Brahman exists in you and your soul is a part of Brahman. The three most noticable things that happen every single day are creation, preservation, and destruction. Brahma can be seen when a mother gives birth to a baby. Vishnu can be seen when a sacred tradition or place is preserved for thousands of years. Shiva can be seen when a person dies. It is a circular process where something is created, preserved, and then destroyed and then created again and so forth. A tree grows up from a seed, gets tall, dies, and the new seeds create more trees. Souls simply find new bodies. It's a remarkable process that is responsible for all of existence. These are all aspects of Brahman.
About other gods, they are all just different ways of worshipping the one God. Since everything is a part of God, it doesn't matter which rituals you perform, which gods you worship, or which tradition you follow. You are going to the same direction but from a different side. Everyone will meet at the center of the sphere, so to speak.
What does everyone think?