That wont be easy.
- Sunnis in both Syria and Iraq are being hunted by their regimes.
- In Lebanon, army is inclined to support Hezbollah. Saudis support Shias there.
- US-led coalition (incl. Arab countries) bombing Sunni insurgents in sake of Kurds and Shias.
- Iran and Iran-led militias (such as Kataib Hezbollah) are active in Iraq, and Iran has a military base in Khanaqin, Iraq.
- Iranian ally Houthis are currently attacking against Sunnis in Yemen.
- Iran even brings Afghan refugees (Shia Hazaras) into Syrian campaign.
It would take time to clean this mess.