You have that wrong: an atheist is not made, an atheist is born. Every child that has ever been born to humans began life as an atheist.
Every one of them was also born with a predisposition to believe and learn from their parents and community -- a necessity for their own survival. And when parents believe (because they believed their parents, and so on and so on) in gods, they teach their children to believe in gods. Even more, they teach them lots and lots and lots of utterly unprovable things about those gods -- what they want, how to appease them, what not to do to anger them, what to eat, what bits of a baby's body should be snipped off (or not), who you can love (often in what position and under what circumstances), and much, much more.
No atheists are not made -- theists, every brand of them, are.