Someone who makes sense on here 
All those "proofs" are and can never be 100% factual proofs.
Atheist are more stubborn than evangelical Christians now.
I agree soooo many things are wrong with the way Christianity is taught today and there are contradictions in the Bible, but none of that disproves God's existence. One needs to know 100% about everything in this entire universe to come to the accurate conclusion that God does not exist.
Why don't people bash or talk about Islam, Hinduism, Krnsa or other beliefs? You grew up in a Christian society or your parents wanted you to believe the Bible and then you rejected it. Ok, good, keep going, stop bashing Christians and their beliefs and move on to higher thinking?
I like the Atheist who will admit that their is not enough empirical evidence to prove the existence of God. Big difference from believing and claiming there is no God.
James - you're new here. And you're making very broad statements about atheists. Perhaps you can give us some background on why you're here, and what you hope to accomplish by participating?
It's already been pointed out that having 100% factual proof for something is a fairly pointless endeavor. However, if you really get down to the wire, it is not the atheists making this claim, it is the theists. They are, and have always been 100% sure that there is a god. They know this, they accept it, and they push it on anyone who challenges it. I have had theists tell me that I need to have an open mind, yet when I ask them if they have any doubts about the god they believe in, they say no.
Christianity is the religion most members here are familiar with, or know intimately due to being former Christians. If you dig, you will see that Islam, as well as some others have been thoroughly discussed. WE just don't get too many Muslims.
As far as atheists being stubborn, that comes from them being tired of being treated like second class, or lower citizens in their own country. Just like homosexuals, atheists are continuously trashed, and considered lower than rapists according to some surveys. They are treated quite horribly in societies where Jesus is seen on every street corner, yelling at anyone who walks by and does;t say "Amen".
Oh, and by the way, all gods are imaginary - until you prove to me that any one of them is 100% factual.