They all think they are such good Christians, so make them live by it. Call them on it. Make them quote the words of Christ to you. Force their noses into their hypocrisy. Sell it like a tent preacher, too. The first thing you should say in response to anything they say is this, "What Did Jesus teach us to do about that?"
They all claim to be Christians but refuse the teaching of Christ. They are prejudiced. They hate. They are ignorant. Greedy. Jesus didn't tell them to do any of that- His words were the exact opposite. Call them on it. Look, I'm no raving bible maniac, but it doesn't take much to see that they all say one thing on Sunday and do another thing on Monday. So calling them on it is how you rattle them, and it will, I can tell you from experience, rattle them real bad.
All it takes is a simple reply, "well, what did Jesus tell us to do about that?" That will stop them in their tracks, and the next sentence will always be a string of stalls, denials, dodges, etc. And if they attempt to attack you for even bringing it up, you reply, "All I am doing is telling you what the Bible says. Read it in your own Bible. Jesus did not tell you to do that and you know it. What did Christ tell you to do, especially in Matthew? Why are you denying Jesus?" If they try the old "well, we'll just have to agree to disagree." (I love this one), then you respond with, "OK with me if you disagree with what Christ taught you. I'm just telling you what he said." It helps to have a few quotes from Matthew 7 at hand, like 1-5 (my favorite), but this will stop them. If you want to get good at this, then take the time Google and to read some of the things Jesus is quoted as saying in the Bible, and be ready to recite it. You do not have to be a Christian, either, in fact, that isn't the point. The point is to cause a crisis of faith- IOW, if they refuse the teachings of Christ then they deny Christ. Here is the bottom line and here is where they will short out. Remember, you are not attacking their faith. You are simply demanding they live up to what they profess.
