Christian metal is regarded more of a concept rather than a genre since it has no specific musical characteristics.
[4] Los Angeles' Stryper achieved wide success in the 1980s.
In the mid to late 1980s, extreme metal genres were popularized by bands such as Vengeance Rising, Deliverance, Believer and Tourniquet.
[6][7] At the turn of the 21st century, P.O.D., with two platinum-selling albums, achieved a mainstream commercial success rivaling that of Stryper.
[8] The metalcore groups Underoath, Demon Hunter, As I Lay Dying and Norma Jean, dubbed by the music press as "The Holy Alliance", also brought some mainstream attention to the movement in the first decade of the 2000s as some of the leading bands in metalcore and hard rock.