Strange, I am not an exchristian. I refuse to answer further because I think it is a waste of time talking to you. When you can justify a mass murder of billions of innocent human, you are beyond redemption.
You do understand that people who do not believe Christianity will at least include Jews, Muslim, Budhist, Shinto believer, Jainist, IPUist, Jedi, Zeus believer, New Age believer, etc.
If I must identify myself, I would say I am a secular humanist, a naturalist. I believe in science and the general goodness of humanity.