Tehran’s long-term strategy to fortify the Iranian Corridor as a Shiite Crescent requires demographic reengineering. Iran and its allies must be able to rely on a loyal population because of the solidarity it provides at the sectarian level.The attempt to reduce the Sunni numerical advantage is real, but it has had limited results. Even, if viewing the Levant as largely Sunni dominated is a mistake, it seems difficult for Iran to reverse the demographic balance. In contrast, the strategy of promoting internal division among the Sunni promises to be more effective.
From the Iranian Corridor to the Shia Crescent - Demography and Geopolitics by Hoover Institution on Scribd