That's kinda vague on whether or not you want recs, but since you are familiar with Christian metal, but not old school stuff, I'll go ahead and give them. 😆
Trouble (In addition to being one of the first Christian-themed metal bands, they were one of the first post-Sabbath / Pentagram doom metal bands, particularly in America)
Emerald:
Warlord (This is an 80s band but what I'm linking you is from their 2013 comeback album, quite different from their 80s material. Their 80s material is less overtly Christian than this album)
Lordian Guard (90s project from the Warlord guitarist. One of the most unique metal bands i've ever heard. Possibly more similar to 2013 Warlord than 80s Warlord is to 2013 Warlord.)