Yemen is an Islamic society. Nearly all Yemenis are Muslims, with approximately 56% Sunni Muslims, the majority belonging to the Shafi'i school of thought and approximately 44% Shia Muslims, the majority belonging to the Zaydi school of thought. There are also approximately 3,000 Christians, 50 Jews.
Jews are the oldest Abrahamic religious minority. Nearly all of the country's once-sizable Jewish population has emigrated. As of 2008, fewer than 400 Jews remain in the northern part of the country, primarily in Amran Governorate. Since January 2007, the historic Saada governorate community of 45 Jews have lived in Sana'a, under the protection and care of the Government, after abandoning their homes in the face of threats from al-Houthi rebels. The community has abandoned its synagogues in Saada. As of 2008, there was at least one functioning synagogue in Amran Governorate. As of 2014, fewer than 200 Jews remain in Yemen.
There are 3,000 Christians throughout the country, most of whom are refugees or temporary foreign residents. There are four churches in Aden, three Roman Catholic and one Anglican. Ethiopian Orthodox Tewahedo Church services also take place weekly in Sana'a, Aden, and other cities.
Among religious minorities, approximately 1,000 Christians and most Jews actively participated in some form of formal religious service or ritual, although not always in a public place of worship.
Christian missionaries and nongovernmental organizations (NGOs) affiliated with missionary groups operate in the country; most restrict their activities to the provision of medical services; others were employed in teaching and social services. Invited by the Government, the Sisters of Charity run homes for the poor and persons with disabilities in Sana'a, Taiz, Hodeida, and Aden. A Swedish mission organization runs a technical school for the disabled and poor in Taiz. There was also a medical mission in Saada, but in January 2007, the mission reportedly fled to escape the fighting. It is believed that they remained in the region to provide medical assistance to victims of the violence. Another mission operated two charitable clinics in Aden.