According to the constitution, the Tunisian president must be Muslim. Islamism (which many deem a political ideology) is illegal in Tunisia. No political party can be based on a religious programme. Missionary activity towards Muslims is not legal, but conversian from Islam is. There are a few hundred converts to Christianity in Tunisia. Muslim women can only marry a Muslim man. There is religious freedom for other religions, but among Christians, the government officially only recognize the Roman Catholic Church.