If you're referring to Islam, well, that hasn't saved us, or the Iraqis, or Afghanis .. come to think of it, maybe they're better off without a prominent political religious establishment there. Where there is a will for violence and anarchy, the dominant or pre-existing "laws" only become pretexts, never deterrents, or they become marginalized by "circumstances". You have never seen evil until you have seen religion under the Marshall law of the religious, curbed to the side temporarily, until the faithful reach a given objective, promising to resume their piety later when it's more convenient. (a bit meta here, but I am thinking more of Communism than Abrahimic faiths.)
Haiti is from the exact same Moor embryo that gave birth to the Dominican Republic, Jamaica, Suriname, and the two Guyanas. Sure, they might not become a world-class economy any time soon, but nationhood is within their collective conscious. Never underestimate the will of a regional minority to rise up: francophone Haitians are in the middle of Spanish and English Caribbean. Give them sometime, they will be back up better and stronger.