Christianity is mutually exclusive with ethno nationalism.
This applies even if you are one of those WE WUZ THE TRIBE OF ISRAEL types.
In their dogma, emphasis is placed on the primacy of the soul which is separate from and superior to the body. Your soul is 'you' so to speak.
Through the "salvation of soul", the Christian will always allow a racial stranger to bypass conventional and instinctive racial tribal collectivism.
Even Christians who assert the Bible forbids race mixing (it doesn't lol) to remain relevant in an environment where the HBD debate is already won by the evil Nazis will still assert a member of another race who throws their faith in God is their equal on a spiritual level.
This always leads to people forgoing the genetic boundaries in practice.
The body is where the objective evidence of genetic superiority resides and that is why Christians wish to distance themselves from it.