I've just seen in our local paper that a little girl who lives in our town has died. She has been the focus of much prayer since she was taken ill last year. Her parents were thoroughly good Christian people who trusted God absolutely.
The is no way that a loving, omnipotent, beneficent God who notes even a sparrow falling would not have answered these people's prayer.
So, if I had even a scintilla of doubt, it is now gone. There is no God.