Many Kurds in Iranian Kurdistan follow the religion of Yarsanism. About 37 percent of the two million people in Kermanshah Province follow Yarsanism. There may be one million followers of Yarsanism altogether. Around Kermanshah, some Kurds belong to Shia Islam. There are Faili Kurds who belong to Shia Islam in both Iranian Kurdistan and Iraqi Kurdistan. Starting in the 1960s, about 150,000 Faili Kurds were sent out of Iraq into Iran. These Faili Kurds could not prove they had citizenship in Iraq because Faili Kurds in the past had not wanted citizenship in the Ottoman Empire.