I am an atheist simply because I don’t believe in God, gods or anything supernatural. I cannot prove otherwise but the onus is on the claimant to present credible evidence, not just arguments from ignorance (complexity, beauty, science doesn’t know everything, etc.) and other logical fallacies.
I never believed in gods, even during the years that I attended Christian kindergarten and elementary schools. I took the Bible stories as just that — stories. And classmate’s claims that God wrote the Bible made no sense to me. God was just so…not there.
I went through a supernatural phase though. In the 1970’s, I was intrigued by Leonard Nimoy’s In Search Of, pyramid power, the Bermuda Triangle, Nostradamus, and other pop pseudo-sciences and pseudo-profundity. And Disney’s Escape from Witch Mountain had me trying to fly with the mere power of my thoughts. I could feel myself flying with my eyes closed but not when opened. Darn reality.
Also, it took some time for me to completely reject superstition. I had to be careful of my thoughts lest the universe use me as an ironic example, like choke to death on a vitamin pill, or instill cancer if I got too happy or full of myself. Perhaps it was due to residuals from Christianity and/or cosmic karma crap. I got over it. Now, there’s no more universal score keeper. Exciting! Now I can simply be responsible for my actions, not thoughts, and balance my personal needs and desires with social responsibility and environmental stewardship. No gods required.