Religious Freedom Ranking: 3.5 out of 5 stars: Needs Improvement

Founded in 301 CE by Marinus the Dalmatian of Rab, a Christian stonemason fleeing the religious persecution of Roman Emperor Diocletian, San Marino claims to be the world’s oldest republic with its constitution dating to 1600.  Its current population of 32,000 is primarily (about 90 percent) Roman Catholic.  Other religious groups include small numbers of Jehovah's Witnesses, Baha'is, Muslims, Jews, and members of the Waldesian Church. In recent years the number of members of the Orthodox Catholic Church has greatly increased due to immigration from Eastern Europe.

San Marino’s Constitution provides for religious freedom and there have been no recent reports of abuses of this right.  While there is no state religion, there is Catholic religious instruction in public schools but parents may elect to have their students excluded.  In addition, the Catholic Church receives monetary support from state income taxes, but taxpayers, as an alternative, may designate either a local charity or other religious group to receive 0.3 percent of their taxes.

2010 US State Department International Religious Freedom Report on San Marino

San Marino - New World Encyclopedia 

CIA World Factbook