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The question has two parts:
How and why
Regarding how prophet Muhammad (PBUH) began a new religion:
It was Allah (God in English) will to conclude all previous messages of God prophets with the last message of prophet Muhammad. So, it is not prophet Muhammad who started the new religion but it was God will and command to him to convey the message of Islam to humankind through the God revelation of Quran; that reflects real God words in its real revelation language (Arabic) to prophet Muhammad through the angel Gabriel (Jibril).
Regarding why prophet Muhammad (PBUH) began a new religion:
Islam is not a new religion. It is the religion since the start of universe creation and was the call of all God prophets although named differently by different prophets. Refer to related question below. However, Islam per Quran revelation to prophet Muhammad (PBUH) was to correct for the deviations and alterations that were introduced in previous holy books by some people to fix certain beliefs and ideas and for other reasons that could be referred to in the related question below on why was Quran revealed.
What else can I help you with?
What religion did Muhammad begin?
Islam
When did Muhammad begin teaching about Islam?
Muhammad started teaching Islam religion in the year of 610 A.D
When did Muhammad start a new religion?
739 ad.
Was the name of a new religion introduced by the Prophet Muhammad?
Islam
Did the meccans like the new religion brought by Muhammad?
At first most of them did not. But with time, and after witnessing the ethics of people who followed Muhammad, almost all of them changed their mind and join the new religion.
What caused Muhammad to begin the religion of Islam?
When he received the message from God, when the people had been very from God.
Who came to Muhammad and told him to start a new religion?
A:Muslims believe that the angel Gabriel (Jibrel) came to Muhammad. Islam teaches that Muhammad did not so much start a new religion as reveal ancient truths on which Judaism and Christianity were already based.
What religion is based on the teachings of Muhammad?
Islam is the religion based on the teaching of Muhammad.
In what religion is Muhammad favoured?
The religion that Muhammad is favored is the Islamic religion. The Islamic religion regards Muhammad as its most important prophet, and pilgrims to sites he visited are important parts of the religion.
Which religion was developed by Muhammad in 602?
Muhammad did not develop any religion. He was a prophet of God, and he conveyed the religion of Islam.
What religion was Muhammad, the founder of Islam?
Muhammad, the founder of Islam, was a follower of the religion of Islam.
How did Muhammad react to the wealthy ignoring the poor?
He was sad and made a new religion, Islam
