I Am An Agnostic Atheist?

WHY A new question has cropped up. Is it due to vanity that I do not believe in the existence of an omnipotent, omnipresent and omniscient God?

I had never imagined that I would ever have to confront such a question. But conversation with some friends has given me, a hint that certain of my friends, if I am not claiming too much in thinking them to be so-are inclined to conclude from the brief contact they have had with me, that it was too much on my part to deny the existence of God and that there was a certain amount of vanity that actuated my disbelief.

Well, the problem is a serious one. Why I Am An Agnostic Atheist?