"You can't prove God exists and you can't prove God doesn't exist." This is the response one often hears when the question of God's existence is raised. 

It is true in one trivial sense, but quite misleading in another critical sense. If we are using "prove" in the strict sense of absolute certainty, it may be true that we can't prove or disprove God's existence. But this does not mean that there is no good evidence or arguments for God, which might make belief in God's existence very reasonable. We know very little (if anything) with absolute mathematical certainty, so certainty is neither a reasonable or necessary standard. Like virtually all of our other knowledge, I think we can show that it is highly probable that God exists.