I have not used this guide, but did read most of the books recommended. I’m currently using the ancients guide, and they really don’t state much commentary so I doubt you would have issues w/the SCM guide itself, but as stated I haven’t used it yet:) I think there are some references (in the books) to the church selling indulgences (people paying to have their sins forgiven)…which was true back then. Also some stories painted monks in a negative light…there was corruption going on. But as you said that’s history. I don’t feel that any of the books were Catholic-bashing, just stating things that were going on at the time. Not sure if that answers your question! Blessings, Gina