Kant regards positive religions or ecclesiastical faiths (including Christianity) as temporary moral crutches that we can shed as we approach the pure natural religion of reason. Christianity’s institutions, sacraments, dogmas, are the stoicheia leading us to enlightenment.

Here we see the problematics of Christian sacramental theology, going back at least to Augustine, coming to fruition (or going to seed). Why does Christianity retain all this earthliness? Aren’t we supposed to be in a new covenant?

That is the question of modernist theology.