American Republican Christianity is not strictly conservative.
Even more, it's not a single thing. The American right is a big tent which includes everyone from moderates to paleoconservatives, who are like organic anti-statist fascists.
I am a crunchy paleocon, and here's my branch of the Republican party:http://www.rep.org/
Death metal is mostly outside the bounds of the soft and hard left flavored liberal politics in America.
Death metal is entirely outside the bounds of modern society, which is exclusively liberal.
Grindcore is leftist; death metal is, for lack of a better term, realist. That makes it overlap with the right more than not.