At this point, it is not worth the fight. Let the RCC, which has strayed greatly from God’s word, go down in homosexual flames. Those who love God and the truth, come out of the abomination. Right now, Francis is a moderate!! There are much worse folks behind him...
And the reason for the Catholic Church's supposedly impossible "defection" (which I'm surprised you didn't mention) is that in reaction against Protestantism's biblicism it latched onto both "higher criticism" (invented by Protestants) and evolutionism, all as a means of discrediting the Bible as trustworthy. "The Bible is the work of stone-age primitives" has become the ultimate justification for Catholic/Orthodox oral tradition.
I also reject sola scriptura, but the Jewish Tradition has never had to resort to defaming its Bible as full of myths and errors in order to justify its own authoritative interpretive oral tradition. That Catholics and Orthodox chrstians have to do precisely that to defend theirs shows that their traditions have no validity and are not from Heaven.