Christianity, Hinduism and other religions amongst the migrant workers Main minority groups: Shi'is (especially Twelver or Ithna'ashari) (15%, Council on Foreign Relations, www.cfr.org), Isma'ilis 700,000 and Zaydis Muslims About 15 per cent of Saudis are Shi'i, mainly in the Eastern Province or 'Ash Sharqiyah' (in particular the al-Hasa region), but with substantial communities elsewhere as well.