Convert them to Alcoholism [Bacchic worship] instead - it is easier. With everyone there dead drunk or in heavy hangover, they would not make much trouble either for themselves or for others. The place will be all puked over, true, but it already is.
You could convert them to voodoo or rastafari and it'd be an improvement.
Many things are well-known here in Iraq but seldom, if ever, mentioned in the news. For example, Jihadist bombers are notorious for engaging in debauchery on a stag party scale the eve of their “holy mission.” The modus operandi for their crime against humanity is to get drugged up and thoroughly drunk the night before, lay up with a prostitute and then start the countdown on their souls by turning themselves into bomb delivery devices which explode while they are still high on drugs.