The common atheist argument is "There isn't sufficient evidence to prove God's existence", etc etc.
Alright. Fair enough. But is there sufficient evidence to prove to me that you exist?
Descarte's famous line is "Cogito, ergo sum" (I think, therefore I am). While that is sufficient to prove my own existence, it is not sufficient to prove the existence of anyone (or anything) else.
That being said, there is virtually no way for you to prove your existence to me.
The parallel I'm trying to set up here is belief in a man and belief in a God. Do you believe that I exist? If so, you making the same "leap of faith", as it were, as a theist.
Sure, you can empirically prove through your senses that I exist, but who's to say your senses are right? Senses deceive. Furthermore, who's to say that this existence you envision is real? What if it is not, in fact, a dream? There is no way to empirically prove that this is not the case - just as there is no way to empirically prove that there is a God.
Furthermore, do you believe that George Washington existed? Do you believe that he crossed the Delware River in 1776? Why do you believe that?
This could be paralleled with asking a Christian why he believes that Jesus existed and worked miracles.
Just some thoughts I've been having. Have at them, if you would
