I've heard of Christians being fans of Behemoth, which if you didn't know borrows a lot from Satanism since it's a hybrid of Black and Death metal.
Would be easier to just post this
https://en.wikipedia.org/wiki/List_o..._metal_artists
Let me also say that you don't have to listen to strictly Christian metal bands. It's like if I wasn't aloud to listen to Judas Priests' new album because I didn't believe in Valhalla, or Amon Amarth because I don't believe in Dragons.