The original leader of Islam religion per Quran revelation by God is prophet Muhammad (peace be upon him)
The last Prophet of Islam Hazrat Muhammad SAW is the true leader of the Muslims.
Muhammad is said to be the founding leader and prophet of Islam
Islam original language was Arabic and is Arabic.
Islam is a religion not a spiritual leader. Islam is not dead.
Islam daily leader is called Imam who leads Muslims on praying for God.
The leader of Islam is prophet Muhammad (peace be upon him) and started in Mecca (or Makkah) in Saudi Arabia.
Islam
The leader of Islam after prophet Muhammad (peace be upon him) is Abou Bakr Assedique (may God be pleased with him).
As far as I am aware Islam does not have a single spiritual leader, in the same way that Christianity has the Pope. Until the end of the Ottoman Empire (1918) the sultan of the Ottoman Empire was the de facto spiritual leader of Islam.
While there is no worldwide leader of Islam, most Muslim communities have an Imam who leads service and provides spiritual help.
Islam started in Mecca Suadi Arabia