Of the two I would certainly prefer Christianity. I think it would be easier to use within the Western world since it already has a long history within the culture. It would need to return to something of its roots when it was a religion of strength rather than the limp wristed defeatism it currently manifests as. There's an old morally strong foundation to build on but we need to unearth it first since they last several decades have done nothing but layer weakness and degeneracy over it.

On the other hand, those most in need of such a guiding light seem least likely to follow it. It has become hip and cool to abandon religion. Many are currently wandering aimlessly with little more direction than an aversion to the religion that came before(Christianity).

I'll definitely agree that these are conundrums for someone cleverer than us, though I worry we may be the only ones working the issue at all, so maybe that just means we need to step up our game.