There was not wide diversity in the first century Christian congregation. Only after the death of the apostles did widespread disunity and false teachings develop.
We should not be surprised that we need to adjust our thinking and conduct in order to be pleasing to God. We are greatly benefited by doing as instructed at Romans 12:1,2 "Consequently I entreat you by the compassions of God, brothers, to present your bodies a sacrifice living, holy, acceptable to God, a sacred service with your power of reason. And quit being fashioned after this system of things, but be transformed by making your mind over, that you may prove to yourselves the good and acceptable and perfect will of God."