Yeesh Van, did I whiz in your wheaties this morning...
I believe that you guys believe there is a real demon called Lucifer, who was the right hand of Yahweh and is now fallen to darkness. That means I suspect that there's a very real spirit called Lucifer out there who may or may not be quite powerful and may or may not be quite evil. I can't say for sure, I don't go looking for things like that, and I pull up stakes and run like hell if I bump into them accidentally. I think he'd be more deadly to you guys than to me, however, since I know some basic safety protocols and I don't go blundering around waking up Dragons.
Actually most Western Pagan religions DON'T have a single supreme evil - they have a lot of less than supreme evils (in the same way that they have a lot of less than supreme goods). They break the idea of pure evil down into facets of evilness, the better to understand and fight them. Fighting evil is an almost impossible task, but fighting tendencies towards specific evillnesses is much easier.
Some religions, like Wicca, don't have an evil at all, believing that what we perceive as evil is merely the other side of natures coin. Of course, it's easy to forget how extreme that side of Gaia can be and forget about the Morrigan.
As for whether all religions reference the same Gods using different names. I'm not sure... The Roman God of War is very different to the Greek God of War, who is different to the Aztec God of War. They might all be different facets and spins on a larger warlike archetype, I guess, but I don't know for sure.
Regarding your earlier post about Bush - there is a tendency of some Republicans in the US to split the world into "them" and "us" and decide that anything "us" does is acceptable and anything "them" does is evil and immoral. I'll be back to you, probably in a seperate thread on the General board, with a full list of what I consider to be the evils of the Bush regime - although I see you dismissed the general issues I raised as "fluff", perhaps if I couch them more formally you'll feel the need to respond in detail.