The first Islam leader is prophet Muhammad (Peace be upon him) who conveyed God message to humanity and called people to Islam and conveyed to people the words of Quran as revealed to him by God. After prophet Muhammad death, Muslim leaders are called Caliphs, Imams, Sultans, Princes of believers. ...
Muhammad is said to be the founding leader and prophet of Islam
Prophet Muhammad (peace be upon him) is the original leader of Islam.
you call " Islam" the religion
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.
In English you call him: leader of the mosque. But in Arabic you call him: Imam ul-masjid. However, most people just call him : Imam.
The leader of Islam is prophet Muhammad (peace be upon him) and started in Mecca (or Makkah) in Saudi Arabia.
The original leader of Islam religion per Quran revelation by God is prophet Muhammad (peace be upon him)
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.