lucky severson reports from los angeles. >> it is because satan has tried to make us think and have triedo make us believe that it's nothing. isn't that just like the enemy? that it is less harmful than alcohol. isn't that how satan comes in the back door to make you think that one sin is greater than another? you all have to say "amen." >> reporter: it's sunday, so bishop ron allen is guest preaching in church. any other day of the week and he'll be preaching the same message to anyone who will listen. ishop leis predent of the international faith-based coalition, comprising what he says are over 4,000 churches nationwide. his one mission is to teach drug prevention to church leaders, and more urgently to defeat proposition 19, which would legalize marijuana in california. >> first, it decriminalizes low-level possession of marijuana of up to an ounce by adults 21 and over, eliminates all penalties for that offens and allows adult 21 and over to cultivate small amounts of marijuana also for their personal use. and then the second thing that it does is it allows local governments to decid