Luther has been white-washed into Catholicism, and then Catholicism misunderstood from the lens of being opposed to that white-wash.
For instance, Catholics believe in Sola Gratia, that only through the grace of God are people saved. If you are saved by the grace of God, you will necessarily have faith AND you will necessarily take part in sacraments and works. Luther preached what he called “Sola Fide,” but what he explicitly meant is that you could be saved no matter how wicked and deplorable your acts were. This is why his doctrine was opposed by the Church.
Catholics believe that all scripture is inerrant, and no doctrine necessary for salvation lies outside of scripture. Again, most people would recognize that as what Luther taught, but what Luther REALLY taught was that any doctrine that was outside of scripture was of the anti-Christ, and that by “outside of scripture” he meant outside of his biased, angry interpretation of those books of scripture which he judged fit. It wasn’t that atoning offerings, purgatory, the veneration of saints, etc. weren’t biblical; it was that after removing 14 books of the bible, it was no longer clear what was being referred to.
His creed was not simply “sola fide”, it was “sola gratia, sola fide, sola scriptura”—"we are saved solely by the grace of God, through faith in God, with the Bible as our sole spiritual authority."