MagisterCultuum
Great Sage
It used to, but I don't think it has since moving to BtS.
Yeah I think hell spread stops at the consecrated altar level?
Personally, I think the game/mod should have some sort of Wonder, Event or something (like Killing Hyborem) that stops totally the spread of hell terrain. For now, I don't think the Altars have an impact on that.
In my recent multi player game, we were both neutral and the Hell terrain was ot spreading inside our borders. I'm not sure if this was related to the Altar or not.
Wierdness. Size of map/number of civs was the only thing I could think of. Every game I play winds up inexorably marching on toward Doomsday...