Galatians 2:3

Paul’s fear was not that he had been preaching an erroneous gospel. It was that the false teachers who were saying Gentile converts had to become Jews before they could experience justification might undercut his work (cf. Acts 15:1).

". . . Paul could never tolerate any presentation of Christianity which regarded it as a form of Judaism." [Note: Guthrie, Galatians, p. 67.]

James, Peter, and John agreed with Paul, the proof of which was their willingness to let Titus remain uncircumcised. Circumcision was a rite by which Gentile males became Jewish proselytes.

"Within the crosscurrents of political messianism and apocalyptic speculation, the idea grew that the Messiah would only come when the Holy Land had been purified of all uncircumcised Gentiles." [Note: George, p. 143.]