I don't see how taking things a step further is idolatry, nor innovating (and possibly creating) 2 genres of music. Even if he did not appropriately acknowledge what he was doing, what he created were some of the most infuential works to this day, to bands both good and bad.
If a man innovates music, is it really his fault if he is copied?
Whichever way you see it, this is not an arguing thread, but instead a place for members to write good things about whomever they feel worthy (with emphasis on metal music), and I would hope all these petty argument posts would be deleted.
During a time when the metal music industry was still dominated by would be posers, the NWOBHM, and glam/hair bands, Slayer transcended even the standards set by the bands around them to become quite possibly the most infuential band since that time. Where other bands such as Anthrax and Exodus sung aggresive lyrics with pumping guitars, Slayer took it a step further with their music, adding technicality and extremity both to their music as well as their appearance.
At a time when most bands, admittedly or not, dodged appearing overly antisocial, Slayer used Facist and Satanic imagery unbashedly and sang songs that were both literally brutal as well as allegories in their own right.