Any "Christian" band that would promote anything that is not of God eg. mosh pits, violence, throwing up devil horns, they are surely not bringing people to God, and in all honestly they are not a Christian band and are in fact working for the enemy. Even the demons call Jesus lord and call him by name
James 2:19
Thou believest that there is one God; thou doest well: the
devils also believe, and tremble.