I've come upon some fantastic ways to really get under the skins of our atheist friend. All of these have been tried here before with great success. Try these, they really work! (stolen from some website somewhere)
1) Ask them why they are bitter against God.
2) Tell them that if there's no God, they might as well go out and kill people.
3) Ask them to pray with you.
7) Tell them that the universe is too complex to "just exist," and must have been created by a God who "just exists."
13) Use the Second Law of Thermodynamics to disprove evolution.
15) Insist that the Constitution is based on the Ten Commandments.
18) Tell them they know in their hearts that God exists.
19) Point out that we all take things on faith.
20) Before starting an argument, say "You're an atheist? That means you're going to hell!"
24) Drink the last beer in the fridge.
26) Witness for Jesus, and completely ignore anything your competition says.
37) Explain that the lack of proof doesn't mean it didn't happen.
45) Insist that the Bible is meant to be taken literally -- all except that verse he just showed you.
49) Point out that the fact that he talks about God so much proves God's existence.
51) If a plane crashes killing 300 passengers and crew, but one little girl survives with only third-degree burns, tell him that this miracle proves the existence of God.
59) No matter what he quotes from the Bible, say that it's out of context.
60) ...and when he points out that the quotes are in correct context, tell him you need to be a Christian to understand the true meaning of the Bible.
65) Talk about how you used to be a miserable, sinning, drug-abusing, alcoholic, sex-addicted, spouse-beating criminal until you found God.
80) Insist that a person who makes Christianity look bad was not a True Christian.
82) Smile smugly and tell him that there are no atheists in foxholes.
89) Equivocate scientific faith with religious faith, and conclude that, metaphysically, you are both in the same boat.
97) Claim that circular reasoning is legitimate due to circular reasoning being legitimate.
99) State that Christianity has done a lot of good along with all the mass murder.
103) End all your posts with John 3:16.
104) ...or "God Bless."
114) Most carefully of all, explain that while all of the Bible is inerrant, Revelation does not literally mean what it says.
120) Claim that Einstein was a Christian.
121) Claim that Darwin recanted evolution on his deathbed.
124) Say that evolution is not proven -- therefore the Bible is correct.
125) Tell him it's his responsibility to prove that God doesn't exist.
134) Say that God can't reveal himself with any real proof, because that would remove the need for faith.
135) When something awful happens, tell him not to blame God -- he doesn't interfere.
136) When something wonderful happens, tell him to credit God -- he made it happen.
137) Tell him not to ask what happens to those who have never heard of Jesus . . . HE has, and what is HE going to do about it?
147) Tell him that the Bible is true because the Bible says it is.
150) Tell him that he's playing right into Satan's hands, because Satan's greatest ploy is convincing people that God doesn't exist.
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