I have no doubt an action film starring Paul Bettany looked like a good idea on paper.
He’s got the chops and can be intimidating (see Gangster No. 1). The idea of the Church gaining control of the remnants of humanity after an apocalypse of sorts is pretty good too. Sadly it suffers from being extremely tedious; so much so I had to read Wikipedia to remind myself of the ending!
Worse yet, despite clearly being on a similar level to movies like Equilibrium it perseveres in being serious and dour, rather than embracing its stupidity and being somewhat enjoyable.