None, insofar as Church doctrine is concerned. Probably quite a bit regarding Church policy. Doctrine is somewhat analogous to the Constitution of this country versus public policy. For analogy, there's nothing in the Constitution prohibiting military women from serving in combat positions. That's just been public policy. Likewise, there's no doctrine saying priests have to be celibate. That's just Church policy. One need only separate that which is Church doctrine from what is just Church policy to realize what can be changed and what cannot. Adults can tell the difference, children cannot.
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