Policing thought is never a good idea. What will work however is simply granting wider access to information and insuring the populace is taught at a young age to be curious. Curious people ask questions and the most dangerous thing to any religion is an inquisitive perosn. The second someone honestly examines their faith is generally the beginning of the end.

Some people have to be dragged kicking and screaming into modernity others should just be left in the dark ages to be killed by barbarians.