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Islam in Yemen dates back to about 630AD, when it was introduced into the region by Ali when Muhammad was still alive. It was during this period that the mosques in Janad and the Great Mosque of Sana'a were built. Yemenis are divided into two principal Islamic religious groups: 65% Sunni and 35% Shia. Others put the numbers of Shias at 30%. The denominations are as follows: 65% primarily of the Shafi'i and other orders of Sunni Islam. 33% of the Zaidi order of Shia Islam, 2% of the Ja'fari and Tayyibi Ismaili orders of Shia Islam. Yemen is home to the Sulaymani Bohra community, a subdivision of Tayyibi Mustali Ismailism. The Sunnis are predominantly in the south and southeast. The Zaidis are predominantly in the north and northwest whilst the Jafaris are in the main centres of the North such as Sana'a and Ma'rib. There are mixed communities in the larger cities.
According to WIN/Gallup International polls, Yemen has the most religious population among Arab countries and it is one of the most religious population world-wide.