I think the struggle would be that Christianity is supposed to be inclusive and welcoming regardless of colour or creed. And while in theory I agree, in practice I can't stop myself from preferring to be among (mainly) my own people regardless of their religious beliefs. While I'd prefer 5 Nigerian Christians living on my street compared to 5 Pakistani Muslims, I'd probably rather 5 non-religious Europeans.
Even if those 5 non-religious Europeans want to convince your son to be transgender and godless?
I hear what you're saying and it speaks to how the nations are seemingly meant to be - immigrants should be the exception not the rule, the same for mixed marriages and such things. Not this Babelesque situation. But loyalty to ethnicity over Godliness & fellow Christians is not going to lead down a good path. Refer to Christ's conduct with the Samaritans... the Jews would have no dealings with them on the basis of ingroup preference but Christly humility and love for one's neighbor (which unambiguously extend beyond our own ethnicity) trumps all.