The leader of Islam after prophet Muhammad (PBUH) death was titled ' Khalifa' in Arabic or Caliph in English. This means the successor. The plural in Arabic is 'Kholafaa' or Caliphs in English.
Islam religious leader is prophet Muhammad (peace be upon him).
Their human leaders are the Mullah and the Ayatolla. Their god is Allah. Their prophet is Muhammad
Caliphs
Muhammad was the main prophet of Islam.
H. Abu Bakar sidique Ra the first caliph was leader of Muslims after death of Prophet Muhammad SAW.
Prophet Muhammad.
With the name of almight Allah; leaders of Islam are Muhammad (last prophet of God), his successor Ali (first Caliph/Imam of Islam) and then progony of Ali (Imams).
Prophet Muhammad (peace be upon him) is the last leader of Islam per Quran revelation to him by God. Leaders of Islam extend from Adam through Noah, Abraham, Moses, Jesus and ending with Muhammad (peace be upon them all).
The religion is Islam. see related question for more information.
Muhammad ( PBUH ) is the Prophet of Islam.
The prophet Muhammad is often regarded as the founder of Islam.
Prophet Muhammad (SAW) is the last prophet of Islam .