I think your going to have problems getting responses to this, simply because the article is so long and covers so much theological ground. I agree with most of chapter 1, except the alleged Catholic characterization of the “guilt” of original sin.
Chapter 2 is a complete waste of time. It’s the old theory that St. Augustine basically corrupted Western Catholicism. which ultimately led to the Protestant Reformation. Ironically, the author doesn’t cite Augustine’s works a single time, preferring to rely on theological treatises from Eastern Orthodox writers. It goes on to critique St. Thomas Aquinas. It’s so bad that I didn’t bother to look at the citations. I’ve read a lot of Augustine and Aquinas. You aren’t going to find anything worthwhile in chapter 2.