Right, but apart from your family history you cited only three bands. Mostly NS bands who are not quite representative of metal you would have to admit. I can see how your argument works on the back of NS bands, but lets not take black metal with national socialist tinges as the culmination and 'true' representation of all Metal, please. Beherit, it's arguable whether they were, in fact, a reactionary band. There are, certainly, elements of embracing something spiritual at the end of their anti-christianity/'paganism'.
Metal can easily be seen as a rebellious movement, a reactionary movement. It's pretty obvious, at least prima facie. Satanism as a reaction against chritianity, 'Anti-god' rehtoric as a reaction to the authority of the day. There are many ways to see metal as a liberationist movement, arguiable more so than there are ways to view it is as a perennial movement. As, largely, seeking to throw off authority (a point of trascendence), not to embrace it.
Immolation, Deicide, Slayer, suffocation, mayhem are some that come to mind on the other side of the argument, just to start.
Nature, mystery, ethnic solidarity, will to power - revering these things is revering God. Metal is a different conception of God.
It depends what you mean by God. Certainly not the god of the new testament.
I'm talking mainly on the level of lyrics and overt symbolism. The composition/structure of the music might be a different story. I'm not sold on the issue, i'm interested in counter arguments.