No item of Christian morality is valid only for Christians. […]
The foundation is that (Christian morality) is the correct way of “running the human machine.” Your argument reduces it merely to a way of (perhaps?) getting extra mileage out of a few selected machines.
The horror of the Christians with whom you disagree (the great majority of all practicing Christians) at legal divorce is in the ultimate analysis precisely that: horror at seeing good machines ruined by misuse…. Toleration of divorce – if a Christian does tolerate it – is toleration of a human abuse, which it requires special local and temporary circumstances to justify (as does the toleration of usury) – if indeed either divorce or genuine usury should be tolerated at all, as a matter of expedient policy.