Prove it! (part 1)

I read something shocking today in Revelation:

The beast was given a mouth to utter proud words and blasphemies and to exercise his authority for forty-two months. He opened his mouth to blaspheme God, and to slander his name and his dwelling place and those who live in heaven. He was given power to make war against the saints and to conquer them. And he was given authority over every tribe, people, language and nation. -Revelation 13:5-7

Can you imagine the arguments that the Christians (the saints) are going to have to put up with when this happens? I can imagine it:

(Some Guy stumbles onto Christian, who is praying, and...)
Some Guy: "Hey, prove to me that your God exists!"
Christian:"Well, he's working all around us. Look at His creation. This couldn't happen by mistake."
Some Guy: "Ha! You're getting slaughtered! Our beast taunts your God, challenging Him, but he doesn't respond! If your God really existed, He'd defend himself and the ones he loves."

Here's where you come in. What could Christian say to prove to Some Guy that God exists? Let's hear it in the comments.

Registration Station - part 2

Hey everyone,

Camp registration is now OPEN!!! And new this year... online registration. That's right, you can now securely register through our website here. And if you register online and pay your $100 registration fee before April 16/08, you will receive a FREE RLBC T-SHIRT!