His notion that secularism and hedonism grew out of Christianity is almost diametrically opposite to the truth.
Yep. It was the withering away of traditional Christianity that grew secularism and hedonism, and the freedoms of Western Civilization that allows these spiritual attacks.
Here’s a take from R. Kessin:
https://www.israel365news.com/100769/prominent-rabbi-states-trump-messianic-figure-un-gog/