Atheists, why do you use phenomena to fill in the blanks?

Call me crazy, but uh, which eye-witness to creation are you talking about?? Please don't tell me you're talking about god right? Again, not for nothing, but if I did believe in god, I would find it pretty arrogant of the religious to believe that they would have the capacity to decipher what an all powerful and omniscient deity would think or feel. Just crazy if you ask me.