Prophet Muhammad (PBUH) didn't found Islam. Islam is founded by Allah (God in English). Islam religion dates back to the date of mankind creation. All God creations are created on Islam (an Arabic word that means full submission) to God. All people were created on the principle of submission (or Islam) to God and given the choice to have faith and submission to (Islam) God or to deviate from Islam and worship idols or partners to God. Accordingly, all prophets; including Noah, Abraham , Moses, Jesus, and Muhammad (Peace be upon them) are sent by God to reorient people to right path to God by calling them to Islam (submission to God).
Islam per God revelation of Torah to prophet Moses is called Judaism. Islam per God revelation of The Bible to prophet Jesus is called Christianity. Islam per God revelation of Quran to Prophet Muhammad is called the very name Islam.
Islam religion per God revelation of Quran to prophet Muhammad was founded by the start of Quran revelation by God to prophet Muhammad through the Angel Gabriel (Jibril) in Mecca (currently in the Kingdom of Saudi Arabia) in year 610 AD. Quran revelation continued also when the prophet (peace be upon him) migrated to Medina (also in the Kingdom of Saudi Arabia) until prophet death in year 632 AD.
Islam is the religion based on the teaching of Muhammad.
Islam is God religion that is created by God. It is not something to be found here or there.
The religion is Islam. see related question for more information.
Islam is based on the teachings of Muhammad.
Muhammad was the prophet of Islam. He is considered the final prophet in Islam, delivering the message of the Quran, which Muslims believe to be the word of God (Allah). He was born in Mecca, in modern-day Saudi Arabia, in the 6th century CE, and his teachings laid the foundation for the religion of Islam.
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The religion taught by Muhammad is called, Islam, which means submission to the will of God. A follower of Islam is a Muslim.
The religion revealed by Muhammad - Islam.