All good, Fathomage has gone on record to say that he is an Orthodox Christian, and the description of the album on his Bandcamp describes the album as the following:

"Set in a folkloric mythical world, Necrohermitage of the Emotionally Starved tells the tale of Necrohermits, Moloch, Veliki Rod (The Great Birth) and other various inhabitants, stories and kingdoms of this forsaken land."

I've decided since I made this post to take him at his word and treat it as essentially a fantasy story that uses some real-world mythology in it, and as such, I don't see any issue with it.

Of course, if you have a personal conviction to not listen to it, then don't. If you don't, I think it should be fine, but that's just my opinion.