[andyfox]

"What caused you to believe what you believe about theology?"

Probably the ridiculousness of it: an invisible man in the sky, a netherworld of fire and brimstone, the son of God immaculately conceived and magically resurrected, a burning bush speaking to Moses, etc.

Also the fact that so many religious beliefs mirror the circumstances of the people who had them leads me to believe that those religions and their God/gods were conceived in the minds of people, rather than people being conceived by God/gods.