But as the Scriptures say, even the demons believe in God. Belief in God isn't much of a commonality. The Christian religion unifies many people under a faith in one God, one faith, and one Lord Jesus Christ. Mere theism is so broad of a belief system that it is not very unifying.
Now they just need to find a way to do it without also alienating people. I mean, there's nothing wrong with Christianity. In all theory, it's fantastic. However, put into practice, the effects of people have to be factored in, and that is where things go downhill. I guess it's all part of the tolerance vs acceptance debate, but because of the line between those two variants becoming very blurred, Christianity is becoming a very exclusive, "holier than thou" kind of arrangement. Now, a majority of it is not like this, it's just that outsiders, as with media, tend to focus on the bad rather than the good, because our human nature loves turmoil, so the ones we see and pay attention to ARE like this.
So, unifying for some, maybe, but alienating for [img]http://forums.legendsalliance.com/public/ALOT.png[/img] of others, even those who are quite strong and faithful believers. And it seems that with Church corruption, hypocrisy, contradictions, and the advancements of technology bringing us closer to being gods ourselves, the balance between unification and alienation is starting to tip, and in favour of the alienation side.
The belief in God, et al, should be enough of a commonality, because something about a 'kingdom cannot be against itself', or somewhere along those lines. And when factions split and debate back and forth between one another, then you've got a kingdom fighting itself.