Evidence for God
There have been tons of gods in the past that no one believes in any more. Why? Because as people learned more, they realized there are rational explanations to things they previously attributed to certain gods.
A lot of kids grow up believing in Santa Claus, no one refers to him as a god but that's what he is. He does magical things like fly through the sky, slips down chimneys to place presents under the tree, and rewards you with presents when you're good ... all this in a matter of a few hours. Eventually the kids learn that there is no magic happening there. Their parents and everyone else around them have been lying to them to as a way to keep their kids in check. "Don't act right, I'm not getting you that X-Box for Christmas!"
You can view today's gods the same way. As a kid, you're told that if you pray miracles will happen. Uncle Jim gets cancer, you pray and he gets better. "Praise the lord!" your relatives will say, "It's a miracle of God!" As you get older, you should begin to see that there was more to it than just you praying. People were taking Uncle Jim to the doctor, giving him chemo therapy and all sorts of care involved. You tell yourself "I could have prayed 24/7, but if they hadn't been taking him to the hospital he'd be dead anyway". Just like Santa, they use gods to keep people in check. Act bad and you're going to hell, behave and you can come hang out in the clouds with God later in life. Someone just put a little more thought into the current gods, because so far there is no way to prove that there is no heaven or hell. But there are all kinds of other flaws in the god stories that people just seem to look past.
People think atheist are arrogant when they laugh and point at theists. But it's no different than laughing and pointing at a grown adult who truly believes in Santa Claus.