Well, the first point I'd make is this: Satanism is all about the individual. True individuals shirk tradition. Tradition in music is tradition that denies one of individuality. Considering this, a satanist should have more to say, with the "religion's" emphasis on self-actualization and self-growth, than praise for a biblical conception of Satan, which is truly a sham, as Israelites had no concept of an adversary before coming into contact with nomadic Zoroastrians.
Second, Burzum and Darkthrone had no Satanic lyrics, leaving Mayhem the only of the big 3 to be a Satanic band.
Third, Norsecore bands have a Satanic focus.
Fourth, Sodom is a thrash metal band.
And fifth, black metal's harsh vocals obscure its lyrics, in my opinion, to shift focus toward other aspects of the music such as instrumentation. So even if you took all of, say, Negura Bunget's lyrics and turned them satanic, it would be insignificant as their focus is musical in nature.
I know you're a Bestial Black Metal fan (which I am not) and therefore black metal is largely aesthetic to you, so inevitably, we will disagree on this.
