All Pauline Christian churches (which comprises of the entirety of mainstream Christianity, and any Christian church that is based primarily on the New Testament) go against some aspect of what Jesus taught, especially the Protestant derivatives of the United States.
Jesus--
"Go not into the way of the Gentiles" (Matt. 10:5)
"I am not sent but unto the lost sheep of the house of Israel" (Matt. 15:24)
"...for salvation is of the Jews" (John 4:22)
Paul--
"For so the Lord has commanded us, saying, I have set you to be a light for the Gentiles, that you may bring salvation to the uttermost parts of the earth" (Acts 13:47)
"from henceforth, I (Paul--Ed.) will go unto the Gentiles" (Acts 18:6)
"that the salvation of God is sent unto the Gentiles, and that they will hear it" (Acts 28:28)
"that I should be the minister of Jesus Christ to the Gentiles" (Rom. 15:16)
"that I should preach among the Gentiles the unsearchable riches of Christ" (Eph. 3:8)
(Acts 20:21, 26:17-18, 20, 23, 22:21, Rom. 1:5, 13, 3:29, 11:11-13, 15:9, Gal. 2:2, 7-9, 3:14, Eph. 3:6, 1 Tim. 2:7, 3:16, 2 Tim. 4:17).