Because people didn't know why things were like they are, or what had caused them. I.e. "What created the universe/earth/humans/animals/plants etc."
Islam started in the 6th century, specifically in the year 610 when the Prophet Muhammad received his first revelation in Mecca.
Jesus.
in japan the shinto religion had started
Buddhism is the religion that started in India(sub-continent) and spread over china.
Jesus never started a religion.
He started a whole new religion. I believe that this is a good religion.
Islam.
KKK
Muhammad did.
All major religions started in Asia.
Calvinism started in the later seventeenth century. There is not a parcific date as to when they started calling the religion calvinism. but it was refered too as a religion back in the day.
the religion is so old that nobody knows who started the religion but people have got an idea how long ago it started