J
I'm sorry, but in all good conscience I just can't agree that heavy metal, even with Christian lyrics is not sinful. It is angry, it is not self-controlled, it supports worldly themes that go against God- such as long hair on men, banging their head around, gothic style dress, it is not gentle, the extra fast beat raises blood pressure and is scientifically proven to cause heart problems including massive and deadly heart attaches. The loudness is rude, and rude is the opposite of love, and God is love so it is ungodly. If you are playing this in the hearing of someone who can't avoid it, and they develope heart problems, you are responsible. And to do such in the name of Christ?
ask God to help you.