H. Abu Bakar sidique Ra the first caliph was leader of Muslims after death of Prophet Muhammad SAW.
Caliphs
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.
because they died \
After the death of Muhammad, Islam spread all the way to the northern Arabian Peninsula.
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. ...
Islam is a religion not a spiritual leader. Islam is not dead.
Khawaja Muhammad Islam has written: 'The spectacle of death including Glimpses of life beyond the grave'
Caliph (or Khalifa in Arabic)
The first Rashidoon Caliph Hazrat Abu Bakar RAU was elected the highest leader of the Muslims after the death of Hazrat Muhammad SAW. He liked to be called as Khalifa -tur - Rasool. After him, Hazrat Omar RAU and the succeeding Rashidoon Caliphs were given the title: Amir-ul-Momineen.
http://www.religionfacts.com/islam/history/prophet.htm last paragraph.
No, because Islam was founded after the death of Christ.
Sirah refers to the biography or life story of Prophet Muhammad in Islam. It encompasses his actions, teachings, and relationships from his birth until his death. Studying sirah is essential for Muslims to understand and follow the Prophet's example.