I respectfully disagree with you about the rapture. I believe in pre-trib. Every pastor and preacher I respect teaches pre-trib, but some good teachers believe as you do. I guess we won't know for sure till it's too late to argue about it.
I believe there will be many non-believers who will become saints DURING the Tribulation, and will pay with their lives to be saved.
Romans 11 answers the article pretty well. In fact, if you read Romans 11:15 carefully and in context, you will see that that rapture can't occur until the Jews come to Christ.