other Levantine populations, exhibit "key differences" from other Arab populations; based on HLA-DRB1 alleles, Syrians were close to eastern Mediterranean populations, such as the Cretans and Lebanese Armenians. Studying the genetic relation between Jews and Syrians showed that the two populations share close affinity. Apparently, the cultural influence of Arab expansion in the Eastern Mediterranean in the seventh century was more prominent than the genetic influx. However, the expansion of Islam did leave an impact on Levantine genes; religion drove Levantine Muslims to mix with other Muslim populations, who were close culturally despite the geographic distance, and this produced genetic similarities between Levantine Muslims and Moroccan and Yemeni populations. Christians and Druze became a genetic isolate in the predominantly Islamic world. Language Arabic is the mother tongue of the majority of Syrians as well as the official state language. The Syrian variety of Levantine Arabic differs from Modern Standard Arabic. Western Neo-Aramaic, the only surviving Western Aramaic language, is still spoken in three villages (Ma'loula, Al-Sarkha (Bakhah) and Jubb'adin) in the Anti-Lebanon Mountains by both Muslim and Christian residents. Syriac-Arameans in the northeast of the country are mainly Surayt/Turoyo speakers but there are also some speakers of Sureth Aramaic, especially in the Khabour Valley. Classical Syriac is also used as a liturgical language by Syriac Christians. English, and to a lesser extent French, is widely understood and used in interactions with tourists and other foreigners. Religion and minority groups Religious differences in Syria have historically been tolerated, and religious minorities tend to retain distinct cultural, and religious identities. Sunni Islam is the religion of 74% of Syrians. The Alawites, a variety of Shia Islam, make up 12% of the population and mostly live in and around Tartus and Latakia. Christians make up 10% of the country. Most Syrian Christians adhere to the Byzantine Rite; the two largest are the Antiochian Orthodox Church and the Melkite Greek Catholic Church. The Druze are a mountainous people who reside in Jabal al-Druze who helped spark the Great Syrian Revolt. The Ismailis are an even smaller sect that originated in Asia. Many Armenian and Assyrian Christians fled Turkey during the Armenian genocide and the Assyrian genocide and settled in Syria. There are also roughly 500,000 Palestinians, who are mostly descendants of refugees from the 1948 Israeli-Arab War. The community of Syrian Jews inside Syria once numbered 30,000 in 1947, but has only 200 today.