Prehistoric religions spread only within particular tribes as individual's beliefs amalgamated with others'. Finally, when tribes met they would also exchange beliefs. Prehistoric religions were not codified with strict rules and therefore were subject to much more flexibility than modern religions which have holy books and interpretive works.
Missionaries are the people who help spread a religion.
Philo Loas Mills has written: 'Prehistoric religion' -- subject(s): Religion, Primitive Religion
If we take time as a measure of the spread of religion,then since its establishment ,Islam is the religion which spread or still spreading rapidly in Asia followed by Christianity.
Islam spread from Arabia.
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It spread by Christian missionaries looking for a new place to spread their religion
Islam was the religion that spread from the Arabian Peninsula to Africa.
Migration is cause of spread of religion. As people travel they bring along their religion, and the constitution does not prevent them.
I believe everyone thinks their ewligion is the best religion. If crusoe did not believe his religion was the best, he wouldnot have worked to spread it.
Islam is a religion. Your question is incoherent.
Christianity
buddhism