Underlying Philosophy

Is there a difference between a lack of belief and denial?If yes, what is that difference?To address the original post, the starting point to atheism is simply a lack of belief in theism. We are all born atheists, and belief in religion is a learned behavior.It is probably no different than a lack of belief in Santa Clause, and probably a similar path can be taken.We do not start out knowing about Santa Clause. Then our parents give us gifts and tell us Santa Clause brought them to us, then many believe. Then as we get older, we learn Santa isn't real and lose our belief in him.Edited by Tram law, : left out info by accident

If one doesn't know how to respond to an argument, does that automatically mean that they've lost the argument and should change their previous stance to match the stance of the person with the "better" argument?(Better meaning, more verbose with more information)Also, one thing I've noticed about some people who don't believe in some subjects, is that it's because they can't understand it at all. So because they can't understand it, they deny it. Is there a proper name for this stance?(Example, I can't understand Evolution so it must not be true no matter what.)