Catholic experts on terrorism consider the official Saudi faith of Wahhabism, an eighteenth-century Salafi movement founded on the peninsula, to be a destabilizing source of extremism. For the Holy See, Wahhabism’s threat is existential: Wahhabi intolerance and money fuel violence against Christians and other communities across the Middle East and beyond. To counter this threat, the Vatican is cultivating relationships with non-Wahabbist Islamic cultural centers such as Al-Azhar University in Cairo, which Francis visited last month. Al-Azhar’s Grand Imam, Sheik Ahmad el-Tayeb, visited Francis in Rome last year, an especially significant development given that Tayeb led a boycott against the Vatican in 2011 after Benedict commented on anti-Christian violence in Egypt. Many hope that the renewed relationship will give new momentum to Christian–Muslim dialogue. Wariness about Wahhabism also applies to Syria, where local Catholic leaders remain skeptical regarding a Saudi-backed regime change. It is a simple calculus: Christian communities, whether Orthodox or Catholic, have been protected by Syrian President Bashar al-Assad and his father Hafez al-Assad before that; Sunni extremism could bring Sharia law and second-class status for Christians.
via https://www.foreignaffairs.com/articles/saudi-arabia/2017–06–02/why-trump-and-francis-diverge-saudi-arabia