It is wrong to consider the entire genre "Satanic". It is like presuming all rock music to be Christian. A small proportion may be explicitly Satanic, like there is a part of rock that is known as "Christian Rock". I listen to rock music and heavy metal, and I am interested neither in Christianity, or in Satanism. And my music does not reflect either of these belief-sets.
Besides which, I think that heavy metal music is mainly political? Almost all of my music has a left wing political message.