There is a standard for Christian living—it is the Bible— and not the decisions of a private group of people. All people will one day be held accountable before God for everything we think, say and do. The Word of God will be the standard.
True Christians (those who have been born again by the Spirit of God) want to live by the Word of God. As a believer grows in the grace and knowledge of Jesus Christ, a lot of things he formerly believed or thought to be true will be seen for the rubbish it really is and be thrown out by that person. A belief in a superior race, or a belief in an inferior race, is one of those “rubbish” things.
God’s Word says that a person must be born again in order to enter the kingdom of God (John 3). Jesus explains it to Nicodemus, a Jewish man who had a religion. A relationship with Christ will result in a changed, and changing, life.
Jesus said that He is the Way, the Truth, and the Life, and that no man can come to the Father except through Him.