It was mission that gave them their sense of separate identity from their Jewish roots. The Church was born in Antioch, not Jerusalem.
A quote from a commentary on Acts Chapter Two which sums up much of what has driven my whole adult life.
Pentecost was an amazing miracle, and having sweated to learn an African language without any books or courses to help me, it’s one I really wanted to see repeated in my life. But it wasn’t actually needed.
If Christianity can be expressed in all languages and cultures, then it is also true that it doesn’t belong to any particular language or culture. No one can say that they own the Christian faith.