Most personally convincing reasons you don't believe.

[Jenny A]

My original reason for not believing in the Judeo-christian god is that the Bible sounded like fiction. Even to my preschool ears talking snakes, parting seas, men fooled into believing one son is the other by fur skins, nasty children devoured by bears, youngest favorite sons making good in Egypt, which god can light his own offering pyre contests, world wide floods with floating zoos, people turned into salt, water into wine, making pigs crazy is the stuff of fiction. Now I make finer distinctions, and consider religious scripture to be a genre unto themselves, but not a factually accurate genre. Absent cobororating evidence, I simply cannot believe it.

As to a god of any sort, I see no empirical evidence of one, and find nothing convincing about the nonempirical arguments for one.