Fortunate for you as you have chosen to see it that way, but still pointless within the Atheist umbrella anyway. Same with Atheist morality. There is no absolute good and evil, only that which individuals choose as good and evil. And so Hitler, Stalin, and Mao just simply made different choices than say Jefferson, Franklin, and Adams, within the Atheist umbrella. If you are ok with that, then, again, at least you are an honest Atheist.
Speaking of Jefferson, Franklin, and Adams, what a kooky idea they had when they declared that “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their CREATOR with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.” Kooky at least, under the Atheist umbrella anyway.
Certainly American statesmen who grew up in that tradition have been far better stewards of liberty than have been Hitler, Stalin, and Mao.
But personally, I have never experienced even the faintest hint of anything supernatural in my 50+ years.
So even though the Christian religion has been a beneficial thing on balance, I find no indications that it is true.
Here you are trying to define what an athiest is. That would be like a baptist,catholic,lutheran,morman,protestant,methodist,muslim, hindu bhudist etc, trying to define what a chritian is.You do not know, you can only speculate.Thats like a nonsmoker that has never smoked trying to understand why a smoker won’t quit.