this thread has lost its way.
the original poster implied that "non believers" think they know everything when it actually, in my experience, has been so-called non-believers who accept that they do not know everything and spend their whole lives examining and questioning everything, including their own belief systems, whereas alleged Christians believe one way only and accept it as right no matter how much evidence there is to the contrary, which is fine if you want to be that way, but don't get your knickers in a knot just because someone comes along to question or even dispute it.