How many religions subscribe to "Replacement Theology"?

I do not believe that the gentiles ever replaced the Jewish people in God's promise to Israel. I visited a church not too long ago and they were preaching how gentiles replaced the Jewish people in the covenant God made with Abraham! I am not going back there! I was just visiting with a friend but it really bothered me! I do not believe that is what the Bible teaches! How many religions teach this?