It may have been the "worst thing" he did politically. Do you not understand that?

The article is a book review, that is not the context I see when I read that condemnation. Maybe the book makes that case, but the review does not.

And, referencing your other post, I don't think the scenario in seventeenth century England is comparable to third century Rome. The Roman pantheon was already on the downswing, allowing a priest of Elagabalus to become emperor. A century later Constantine would make a similar move, leading to the still dominant Christianity. Had Heliogabalus been a competent man the move may have been a huge success.

Finally, the personal attacks aren't necessary.

Yeah, sorry about the attack.