That is a big difference. Atheists want to KNOW they aren't worshipping something made up and false.They are not willing to accept a religion without reasons to do so.<quoted text>
I believe I do.
That is sufficient enough.
Atheist want to know the truth, theists want to believe in a religion. It is a fundamental personality difference of how people approach religion. Atheists are actually more open-minded because they can understand that they could be wrong about what they think they know - theist do not believe they could ever be wrong about their religion of choice.