I'll synopsize. The Catholic Church goes to some justifiably convoluted lengths to prove with the article the claim they make at the outset:
"Interpreting the Reformation is complicated business."
The Catholic Church hopes to convince the reader that it really is complicated, and that the reader must look to them for understanding.
The fact is, it is really very simple.
Biblical Christians practice religion as instructed by God and Jesus in the Holy Bible for the glory of God.
Catholics practice a cultic paganism created by men who sought to use religion for their own worldly power.
Period. It is this simple fact which the Catholics attempt to hide from you with the mumbo-jumbo found in this artcle.