Despite their many differences, Traditional Christians of diverse sects seem doomed to each other as shield mates for the foreseeable future, willy nilly. But someday their common dire enemies – modernism and Mohammedanism – will have been vanquished, if only in virtue of their enmity to Truth and disagreement with reality. The spectrum of doctrines found on the orthogonal Right will then constitute the full diapason of political discourse. Assuming they have not by then been forced by exigencies of war into a single catholic confession of brothers in arms – a not unlikely eventuality, in my opinion – will the Christian sects be able to live thenceforth together in peace?
Yes. But only to the extent that they promulgate the same basic taboos. A sect that promotes, e.g., abortion, divorce, or suttee – or (I mean this seriously) nakedness in church or eating cats – can’t be tolerated by any that forbid them. But provided they can all agree with a system of law and custom that resounds their common limits to ethical conduct, there is no reason that different sects may not get along with each other amicably from one day to the next. The intersection of their ukases – whatever their theological springs – will then limn a common civic cult. To the extent that this civic cult is merely orthodox – to the extent, that is, that it does not stray from the basic doctrines of Nicene Christianity – it may win the whole-hearted allegiance of many flavors of Christians and quasi-Christians who disagree with each other irreconcilably on details.
Even the formal establishment of a given sect and the state enforcement of its financial support by all members of the polis need not render superficial heterodoxy – or indeed heteropracty – impracticable, so long as it does not mandate common worship under a rubric that is not likewise common – this being where people tend to draw the line. “Change whatever else you like, but damned if I’ll agree to your changes to the Prayer Book!” Or, more seriously, “I’ll be damned if I’ll ever pray to Moloch! To Hell with you!”
When it comes down to brass tacks, it’s the taboos that sway people. How do you tell whether a people all share a common basic cult – a cult that is common enough, and informs enough of social life, to suffice for social cohesion and coordination, for bonds of mutual loyalty and indeed affection? They mostly share the same taboos. Then they do not irritate each other; thus only may they get along, like husband and wife well used and accommodated to each other, and to their petty differences and disagreements.