If you listen to some pastors, a few months not going to church, drinking, and fornicating makes somebody an atheist. Or 'not being saved'. Although there are some genuine former atheists in that crowd, I think they're a minority compared to those who misunderstand what an atheist is, and those looking for Evangelical street cred. About the only thing that competes with 'former atheist' as a story of redemption is 'former heroin addict'.
I'm not anti-Christian. I'm anti-stupid.