Studying the history of the Christian religion requires considerable study of theology. Your statement is like saying that a physicist does not know mathematics.  I wrote my master's thesis largely on Augustine and I have read his works repeatedly, both in English and Latin. And, of course, Augustine is far from the only theologian I have studied. My "howlers" exist in your "mind" and show YOUR ignorance of theology.

Your saying things such as "the magisterium does not change its teachings" demonstrates your ignorance of history.

I know both history and theology. I have yet to see any expertise in either from you.

I used to know a man who was an expert on the history of the US Supreme Court.  He was not a lawyer, but he knew more constitutional law than most attorneys. 

Your statement about psychology says that you know it on a high school level. I am not surprised.