Islam is the state religion of Yemen. Religion in Yemen consists primarily of two principal Islamic religious groups: About 10% of the Muslim population is Shia and 90% is Sunni, according to the International Religious Freedom Report. Sunnis are primarily Shafi'i but also include significant groups of Malikis and Hanbalis. Shias are primarily Zaydi and also have significant minorities of Ismaili and Twelver Shias.