The future belongs to those who will show up to claim it. Without continuity your culture is dead within so much as a generation. Sure, your descendants may still give up their birthright “for a mess of pottage” or “sell the family farm” or grow up to mock the culture a values of their fathers anyway. But to give up progeny is to give up period. Without posterity you conserve NOTHING.
Those who show up for the future will claim it, be they the descendants of Muslims or Mexicans.
Not every wants, or should have kids.
My parents shouldn’t have had me or my sister; I don’t want kids.