Kingdoms of Grace (2008)

The day of reckoning has begun. And the souls of mankind rest in the hands of Sierra, an atheist, junkie college girl, and Father Stone, a hunky young Catholic priest who must protect her from Satan's army of evil knights. It appears that the good guys will lose in the impending Armageddon unless some misplaced biblical relics find their way back into the hands of the church. Throughout their battle with evil, Stone and Sierra must deny their rising feelings for each other, as giving into them would jeopardize their responsibility to mankind.