The problem is that the existence of God is viewed by most people as a given, kind of like the theory of evolution is a given, oh wait...

True, but not quite what I was attempting to say. In my experience, most of the religiously-afflicted equate atheism with having no opinion, not with having a negative opinion in regard to pious poppycock. Not only do they seem to feel that we have no opinion, but also that they are free to rush in and insert their ridiculous opinions in that seeming philosophical hole.

In truth, by being compelled to rebel against the complacent and conventional, free-thinkers almost invariably have more completely analyzed the situation. Nonetheless, the religious seem to persist in thinking that we just haven't gotten the 'word'.