✔ 最佳答案
I don't know much about heavy metal. But many Christian music in the Western culture nowadays are a little bit rock.
The bible doesn't prohibit us to listen to a certain kind of music. But I think the church in HK would usually discourage people from them by the following reasons:
1.) Other Christians / Non-Christians thinks it's not godly to listen to them. To be a good example, we should sacrifice this freedom.
2.) Perhaps it's too brutal (It's merely my guess. I know nothing about heavy metal)
3.) The lyrics in those music are too deviant