I have a few questions to atheists, before I become one.

[Silver]

it's that I am sure that it is created by the question-"Does God exist?" and the inability to answer it.

I believe the ability to answer the question is quite possible. As an intelligent species, we simply do not believe in a great many things for which there is no evidence to support their existences. It would be silly to ponder endlessly over the question Do leprechauns exist?, and the concept of a deity is no different. Sure, a concoction of fear mixed with the comfort of good behavior being rewarded in an afterlife is thrown in there to keep one tethered to the belief, but once one realizes that those ingredients are merely there to keep one prisoner it becomes much easier to dismiss all that is based on Faith.