Many major religions spread through?

There are lots of religions in the worlds and some of them have spread wide enough to reach the places very far from its origin. The reason for the spread fo the religions is that many of them have books which are distributed to people and also some of them send missionaries especially to areas that are not reached by the civilization easily.

many major religions spread through: written word or missionaries The most popular religion that the world currently hase (christian) became really popular because its holy script is written in latin alphabte, which make it became easy to interpret from all over the world. Missionaries helps to spread the religion to the small unreachable regions.