Judy is right. Jesus will be coming back to earth, but if you read 2 Thess it says it will be AFTER the man of lawlessness is revealed. In another place (I can't remember which one) it says He will come at the 7th trump. Again, that's at the end of everything. It won't be a "rapture", it will be a second coming of Jesus.
Edit: The reason why believing in a pre-trib rapture is dangerous is b/c when the antichrist is here on earth, he will be doing all sorts of amazing signs and wonders, and many people will be deceived into thinking he is Jesus come back to earth. That is what's known as the great apostacy.