Is it a Christian game? Well, after some quick Google searching, I found this article:
http://www.games.net/article_frame/article_frame.cfm?global_id=111701&src=gamepro&id=48970
From that article, we can conclude that this group is clearly trying to cater this to the Christian market (however that may be defined) in some way even with an anticipated M rating and aiming for next-gen platforms to avoid the low production quality stereotype. They are also looking to convince a major publisher to fund and sell their project (an extremely important step not taken yet). An interesting note is that the player can choose a faction to side with in this war and it is not just Christian. The player can choose either the Anti-Christ, Jewish, Christian, or Muslim factions.
My speculation is that they are trying to sell this first project by riding on the Left Behind commercial success. While that may upset some members here, from a pure business development view, that might be the one feasible way to convince a current major publisher that this can be a serious money-maker.
It seems, in my opinion, the focus is on the dynamics of the end-time conflict. More about fighting the Anti-Christ-like force than the return of the Son of God.
Honestly, I am more interested in keeping track of this game to see if a major publisher will pick this developer group up with this project starting their portfolio.