Im_free
I was a bit puzzled by your second post. You seem to be under the impression that atheists deny that Jesus ever existed. In my experience most people accept that there probably was such a religious-political Jewish leader active in the Middle East at that time. However atheists reject the notion that this individual was in some sense divine, on the grounds of lack of supporting evidence.
You are arguing I think that the subsequent growth of Christianity could not have happened by chance. In fact its major influence on Western society might never have happened without one event - the conversion of the Roman emporor Constantine. Anyway, couldn't a Hindu argue in exactly the same way? How could their religion have grown to 1 billion adherents by chance?
You're obviously full of questions and I'm sure you'll be searching for answers. My recommended reading would be 'The Magic of Reality' by Richard Dawkins - it's very clear and readable.