You ask why rational people try to engage theists into critical thinking, then go on to detail how you, like most atheists, began as a child being conditioned to believe the theist myths of your parents until you discovered the skills of critical thinking and objective reasoning.
So you prove that theists can break their conditioning but then question why we bother trying to free the minds of others who, like us once, were brainwashed.
+1, David Hume and Kant had similar views. Humans are rational beings, believing in a "god" without any objective reason(Evidence) to is irrational, and disregards the entire concept of having the ability to reason and think. Theists are quite possibly the dumbest people on the planet. It's almost as if they "want" to give away their ability to reason, like mindless zombies.