Research says otherwise - that atheists know about more about religion than religious people do. That's because a large number of atheists were born into families where the father was the father, or who, like me, spent 5 years at a religion church school, 10 years as an evangelical Christian, then a number of years converting to Judaism, a few years living as a Jew, then 10 years studying comparitive religion. This is normal for many atheists.