@SolEiji -- Living beings with the alignment subtype tend to be affected more by the "alignment" aspect of damage. However, your chart does support my material + physical type.
How about DR 10/Epic and adamantine? Or DR 15/adamantine and (alignment), basing the alignment around what the god had?
The god was evil, and a greater one at that. However, because he was so evil, and tried to overthrow all the other gods, he was turned into a lesser god, and sealed. Centuries later, his followers who still worship him, and want to bring him out (most of them are liches or other intelligent undead, or immortal) have found a way to break the seal, and release him. However, they have no body for his vessel. Merely some of his flesh. This they'll use to construct a godflesh golem. They'll still need to get him in his proper body, but at least he'd have something to house his conscience in for the time being.
Just realized I had Deities & Demigods, but don't know if I want to use this. A lesser deity (rank 6-10) was DR X/+4. In the 3.5 update, it's DR 20/epic. It does seem a bit high, but I could probably live with it being DR 15/epic and just fluff it that over the centuries the flesh deteriorated slightly. It was well preserved, and it is a god's flesh.