What did Paul mean when he said that he became all things to all men?
20 And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;
21 To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law.
22 To the weak became I as weak, that I might gain the weak: I am made all things to all men, that I might by all means save some.
1 Corinthians 9:20-23
It is known from Pauls mission that he sought to make the Christian faith more appealing to the Gentiles. The above statements show that Paul was flexible and aimed to please the masses.
Inevitably, Paul's new flexible approach meant the original Christian doctrine would have been modified and updated to please the population.