I don't know Steve, but it sounds as though this might have been another "any music except for 'x' is of the devil."
'x' being whatever the speaker happens to identify with.
That being said, I cannot see any reason that any type of gothic or death metal could represent God. The viewpoints are opposing. God is light and life and goth and death metal are darkness and death.
I have heard some metal bands playing songs with fairly worshipful lyrics. I have heard and seen rap artists with wonderful messages in the music they perform. I have worshipped by a piano, by an organ, by a guitar, and by accapella.
I have seen God move through a 30 member, 4-part choir. And I have seen him move with electric guitars and drums.
I cannot try and fit God into my comfort box - He will move where He will move.
God Bless, and Happy Thanksgiving.
Chip