in mecca city at age 40 when he heard his first revelation and first talked to his wife Khadija.
Islam was started long before prophet Muhammad (PBUH). It was started by God; the Creator; by start of universe creation. However, Islam per God revelation of Quran to prophet Muhammad (PBUH) started by start of Quran revelation through the angel Gabriel to prophet Muhammad (PBUH) on year 632 AD. Refer to questions below.
Muhammad started teaching Islam religion in the year of 610 A.D
when he was 40 years old
prophet Muhammad (P.B.U.H) Allah made Islam
On the first day of Islam religion start per Quran revelation by God to prophet Muhammad through the angel Gabriel. Muslims on the very early days of Islam were used to gather at 'AlArqam home' to learn from prophet Muhammad their Islam teachings.
If you mean Islam per Quran revelation to prophet Muhammad (PBUH), then Islam started by start of first revelation of Quran by God (Allah in Arabic) to prophet Muhammad (PBUH) through the angel Gabriel (Jibril) in year 610 AD. If you mean Islam in its sense of submission to Allah (God in English), the Creator, then Islam started by start of universe creation. refer to related question below.
The start of Islam is marked in the year 610, following the first revelation to the prophet Muhammad at the age of 40. Muhammad and his followers spread the teachings of Islam throughout the Arabian peninsula.
Islam was not founded by prophet Muhammad. Islam was founded by God since start of universe verse creation. Prophet Muhammad (PBUH) called for Islam per God Quran revelation to him through the angel Gabriel; that started in year 610 AD. Refer to question below. Prophet Muhammad was in year 610 AD at age 40 when he received; , in the month of Ramadan; his first revelation from God. Three years after this event; Muhammad started publicly preaching these revelations.
According to the teachings of Islam, Hazrat Muhammad SAW was the last prophet of Islam. He received messages from Almighty Allah which form the holy Qur'an, the most sacred book of the Muslims. He preached these revelations.
Prophet Mohammed The last Prophet of Islam Hazrat MUhammad (SAW) was born in Mecca, in Arabian Peninsula, in 670 AD. He started preaching Islam in 610 AD.
Allah (God in English) is the founder of Islam. Islam in its universal sense was founded by start of universe creation. However, Islam per Quran revelation to prophet Muhammad (PBUH) was started in year 610 AD.
Islam calendar is lunar calendar and its start day is the day of prophet Muhammad (peace upon him) migration from Makkah (or Mecca) to AlMadinah (or Medina).