Ishmael did not start Islam. Islam was founded by the Prophet Muhammad in the 7th century AD.
Muhammad [S.A.W] spread the word of Islam first
Muhammad did not start Hinduism, Hinduism dates back to around 5,000 years ago and, it was Islam that was found and led by Muhammad, in the 600s A.D.
Because it's a disease
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.
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.
Muhammad, the founder of Islam, was a follower of the religion of Islam.
Muhammad was the founder of Islam and the proclaimer of the Qurʾān, Islam's sacred scripture.
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.
Islam in its universal sense; as full submission to God; is founded by God since start of universe creation. However, Islam per God revelation of Quran to prophet Muhammad through the angel Gabriel started in year 610 AD by start of Quran revelation.
Islam is the religion based on the teaching of Muhammad.