What difficulty are you playing on? Are you playing raging barbs or just normal? How many warriors are you building in your cities in preparation of orthus?
Because i'm just about to report the opposite problem. Monarch difficulty, raging barbs, barbarian world, wildlands. Orthus rushed my civ alone and killed himself after taking down a single bait warrior. The barbs themselves are weaklings that are still sending goblins after me while I have assasins. Animals are virtually non-existant. So far i've found a single bear camp, and no other animal types or units. Playing as svartalfar, this is annoying- I empty out multiple cities using HN units, but then the barbs walk right by them to raze farms or attack my units.
*edit*
also, to the person complaining about sacrifice the weak, It's a powerful civic because you cannot acquire it without also summoning hyborem into the world, which will convert all your land into hell terrain (which is detrimental). On a religion by religion basis it's no more powerful than, say, guardian of nature or social order (which kicks arse now- no unhappiness ever ftw?)
I also don't understand these barbatos issues. If he spawns near you, just move your settler 1 turn further away? then later you get a free XP farm, and after that a free death mana/item.