“Please explain to me what Catholic doctrine he has changed?”
That is not exactly the right question.
When people speak of leftism, they are usually referring to economic leftism (which makes a people poor), political leftism (which enslaves a people), and social leftism (which robs a people of moral standards and artistic discernment).
There is, however, another form of leftism-one that is rarely called by its name. This is theological leftism, and it may be the worst of them all, as it leads one away from God while insisting on its own superiority to “outdated tradition.”
We know that all leftism is of and from Satan. We observe that the proponents of leftism lie constantly, attempt to deceive, coerce those who won’t be deceived, and extol the tolerance of evil—including abortion, divorce, sodomy, promiscuity, and even mass murder. This is true as well of theological leftism. It seeks to foment disobedience to God by appeal to a “more modern,” and therefore superior, “understanding” of the Bible.
When we seek to discern whether a given premise or movement is theologically leftist, then, we can look for several telltale characteristics.
1. Does it claim an understanding of Scripture that is superior to what existed before?
2. Do its proponents rely extensively on falsehood when discussing differences?
3. Do its proponents engage in coercion, either inside our outside their own group?
4. Does it claim the moral superiority of the tolerance of evil, particularly that which allows the indulgence of the sin of lust (divorce, sodomy, promiscuity, etc.)?
5. Above all, does it countenance the slaughter of the most innocent?
There are theological leftists within the Catholic Church, yes, but because its foundations are solid, they have been unable to bring it down. When His Holiness Benedict XVI was miraculously elected pope, it appeared, briefly, that evil within the Church had reached its high-water mark.
It seems to me that Benedict XVI had the Church moving in the right direction, but Francis yanked on the reins, hard.
So it’s not necessarily a matter of doctrine. Even today many people fail to see the harm done by altar girls. And since when is it okay to blatantly violate scriptural instructions (1st Corinthians 14 -34-37)?
Isn't this what almost all Catholics do when they endorse historical criticism and evolution?
And who resigned to help make that possible?