Several years ago at my church the worship leader had a flooded garage and he couldn't get to church service to lead worship that Sunday morning. I attempted to lead worship that Sunday morning at the church. The music of choice was metalcore. The question I have is does God like metal in his church. I know that God has given me a gift in music but is the genre of music an issue that will affect the church service and God's purpose for his family.
I can't speak to the theological component of your question, but I did go to some "Metal Church" services and shows at the behest of an older classmate in my high school guitar class. he was, of course, trying to convert me and I watched some videos and listened to some compilation tapes they were distributing around their community at the time.
I found the church service to be pretty good, especially compared to my grandfather's over the top funeral services in Amarillo, TX. located in a strip mall in a n industrial area. Good mix of extremely heavy heavy metal and a sermon. a good mix of young and old folks. felt like a tight community.
The concert I attended was my first exposure to bands playing in the style of Testament or even Slayer. I was a Metallica guy at the time, so I was impressed.
in the end, I walked away from that scene after a month or so, but I was glad I checked it out. still an atheist. still rockin.