A "missionary", if you want to be polite. 'A threat, a fanatic, a zealot, or perhaps even a terrorist', if you're on the receiving end of said religion spreading, depending upon your worldview.
Religion is usually spread by one person impressing another person with their good character, kind heart, and inner glow.
A missionary
A zealot.
That person would be called a missionary. The work would be called missions.
Muhammad.
A missionary
Immigration travels from all around the world spread to all countries to acknowledge about Islam
A preacher or a missionary.OR if its in forceful ways its a terrorist or a crusader.But really anybody who is religious and talks about it works to spread his religion
there are lots of ways, but there are 2 main possibility's, number 1 is that a big country with that religion concuers a lot of ground and the religion starts to spread, another possibility is that a country with a certain religion gets concquered and that the inhibitants fled the country and spread over the world
Cholera is spread through contaminated water and food. Cholera is unlikely to spread directly from one person to another.
Answerto trade with one another and tell the what the religion is like and they might like the religion and they might enjoy that religion. And also there were Crusades
noncommunicable cannot be spread from one person to another noninfectious cannot be spread from person to person