In my tradition it is actively encouraged to marry beyond one's own "caste" (if any) or local culture or ethnic background. But it is discouraged to marry outside the tradition unless the future partner is prepared to join the tradition (start practising) and raise any children in the same way.I have to ask why are humans who can create civilizations and books infused with wise words or have cities named after specific cultures, against the exchange of culture whether it’s food or our very sons and daughters?
What example or excuse could one make where they are against the sharing of culture and religion with another member of the same species?
If the parents are going to disagree about how the children will be raised, that is not a good thing, nor is it good if one of the partners will not join the collective spiritual practices.