I found this article on Americanthinker.com and wanted to share a few potions of it.

So, assuming you are a theist, what do you say to the atheist who asks, “You don’t (chuckle) actually believe in God, do you (snicker)?”…

No matter what evidence you give, the supercilious atheist finds a way to dismiss it. To him, it is not the case that your evidence for God is valid but nevertheless is cancelled out by his superior evidence against God. No, in the atheist’s mind your evidence does not even count as evidence…  

the atheist refuses to expand his mental universe by also believing in the transcendent things that the theist believes in: God, souls, angels and demons, for example. The atheist restricts himself to a sort of tunnel vision.

And this is where atheism becomes vulnerable. The atheist does not disbelieve in God because he has neutrally examined all the evidence, and drawn the proper conclusion that there is no God. On the contrary, the atheist radically misconstrues the plentiful evidence for God, and he does this because of his false worldview, which tells him that only the physical really exists. Before he has examined the evidence, the atheist thinks he knows that nothing non-physical actually exists, and this assumption governs how he responds to the evidence.

There is only one effective way to respond to the supercilious atheist’s question: Speak his language, the language of evidence and reasoning, of logic and proof… Say something like the following:

“I believe in God because that’s what the evidence shows. But before you try to debunk my evidence, we have to ask, what are your criteria for deciding whether a God exists, and how do you know that these criteria are correct? 

So when the atheist asserts that there is no evidence that any miracle has occurred, ask him: “What sort of evidence for a miracle would you regard as being valid? And how do you know ahead of time that any miracle not validated by this type of evidence must not have occurred?”
 

This is only a short portion of the entire article; the author goes on to take you through almost an entire debate … focusing on the weaknesses of the typical atheist position.  It is really a useful article for BOTH sides… atheist and theist alike.