I have heard people claiming that creationists use a lot of debate tactics like "red herrings, grisp gallops, etc. The way I see it, the debate tactics of Christians, and perhaps members of other religions, are quite simple. 

Christians use three debate tactics, assuming they can even be called tactics, to debate others, and they go like this:

(1) Distortions of Facts

This one is perhaps the most common. If you have debated a religious person, or you have listened to a Christian debating anyone, you will realize that religious people  tend to distort facts. For example, they can tell you that all fossils linking humans to apes are fake, without providing evidence. They can also tell you things like "Christians created the Renaissance".

In other words, they tend to speak out of their asses. Just watch Kirk Cameron in the O'Reilly Factor claiming evolution theory says there are creatures like the sheepdog and the bullfrog, and you get the idea. 

 When this happens, asking for evidence or simply asking why or how, etc, depending on what has been said,  is the best thing that can be done.

(2) Cherry Picking

This is one is very common. Miracles being the perfect example. A religious person can tell you that he got sick, and he prayed, and he got healed. The question applies: how many people get sick each year, pray, and nothing happens? You don't hear them coming back to life claiming there's no God. 1 miracle and at least 1000 miracles that never happaned. You can hear religious people saying stuff like "Look how beautiful flowers are", ignoring all the ugliness that nature has. A religious person can say he gets his morality from the Bible, but the truth is, he only picks the verses he likes. And a religious person can say stuff like "Look what Stalin and Pol Pot did", ignoring the fact that there are thousands of atheists out there who aren't going around murdering people.

Seeing what they want to see, ignoring what they want to ignore. That's how this tactic works.

(3) Distortions of Logic

Damn, we are all familiar with this one. "Everything needs a creator. Exclude God from this rule" Another fine example: "Communists are atheists, so all atheists are commies." I have seen christians and muslims who wouldn't know logic if it hit them in the face with a hammer. 

When debating a person that distorts logic, you get the feeling that you are wasting your time. What would you say to someone who tells you that music proves God before long before people existed angels used to play the harp? Not much. And the sad thing is that nitwits who say stuff like this usually end up thinking they beat you in a debate. O'Reilly, for example, told Kirk Cameron he beat Richard Dawkins in a debate because Dawkins couldn't answer where everything had come from. Apparently calling our ignorance of where everything came from "God" means winning a debate. 

(4) Preaching

This one is so dumb, there's nothing that can be said. "The bible has all the answers." "Jesus is the way." Preaching is arrogant and dumb. It assumes that the non-believer may still be a believer somewhere inside of him.  

Is there any other thing religious people do when debating non-religious people? I can't think of any.