Re "unblack metal":
The music sounded like BM, but because of the lyrics and the spirit behind it, it is not BM.
Guess which black metal elitist said that? It was Jayson Sherlocke, aka Anonymous, the guy who founded Christian "black" metal. Too often you see the claim that it is the black metal artists and fans who reject the Christians, when in fact the Christians themselves often reject the label.
E: You chose "Holy Unblack" rather than "Holy Black". Do you feel that anti-Christian ideology was, at least originally, a fundamental element of black metal? Do you think it is possible for Christian metal to be truly 'black'?
A: I do NOT believe it is possible for Christian metal music to be truly 'black', no. I think it certainly helps the black metal cause if you 'hold to a Satanic ideology'. Black metal has changed and developed in both sound and lyrically over the years. Moving away from the simple 'Satanic' subject matter of it's early years, to the more poetic and story-like lyrics of today. But still, the dark, grim, horrific 'anti-God' themes remain, and this, coupled with the higher pitched shrill raspy vocals, the blast beats, and the unmistakable chainsaw guitar sounds all merge to create the BM sound. But it is the sound and the 'dark feeling' that truly defines what BM is, and the lyrics contribute to this. True BM I believe, is without light, void of hope, therefore Horde can never be classified as 'Holy Black'. Horde contains lyrics in opposition to darkness. In my opinion, 'Holy Black' cannot exist. Darkness disappears when light is present, the two cannot coexist. (
source)
Why take two fundamentally opposed artistic movements and pretend they are all the same genre? Why gloss over the subtle nuances that make metal the genre that it is, full of depth and meaning, ideas and conflict? Much like it doesn't make sense to call a pro-G8 hardcore band anarcho-punk, or to call a spiritual pacifist who speaks out against drugs and promiscuity a gangster rapper, calling a Christian band black metal is simply a contradiction in terms in the name of convenience.