Yet in the past that's exactly what we did. For me to continue believing in God would require me to ignore the whole of geology, astronomy, cosmology, palentoloy, and most of biology. Personally I believe that evidence suggests that man created God instead of the other way around. Throughout history humans have been afraid of the unknown. If particluar they have been afraid of death.
All religions have as their primary theme some philosphy regarding death.
Christians believe in a heaven for the saints and eternal suffering in hell for the sinners. I see this as a rather clever scam. The truth is that there is no evidence for the existence of a heaven or hell. Let me say in closing that Atheism isn't a leap into the darkness. I haven't become evil and bitter.