Can't have a "proven success rate" if never allowed access.  The only such programs allowed by any state have been "christian" to the exclusion of all others.  Atheists aren't even allowed to distribute literature.  Many Eastern religions do not allow proselytizing so they don't force their ideology on anyone.  Eliminate the "christian" aspect and stick to the rest of it and the same or better results will be found.  These programs are just recruiting operations to build their flocks.