You do not know anything about religion until someone, usually your parents, tells you about it. "Tells you"... if only we could all be so fortunate... Sadly, most kids are actually told this stuff is the litteral truth, that there's a heaven and a hell, that it's not the end when you die, etc... and most of them believe it. Take a look around, most of those same kids grow up to become adults and still believe it. A lot of them simply don't question things as they mature. 85% of the world roughly is religious in one way or another, that means 1 out of 10 people are skeptical about their own personal beliefs.