They believed in many gods or polytheism
The emperor who made Christianity Rome's official religion was Theodosius I.
Because many Romans liked the religion as well as some of the people with more power.
to teach their religion
What do they teach in religion degree classes? Well it depends on which religion and yes there are a number of degrees for studying about religion. Good luck on getting that degree.
Romans had a polytheistic religion that closely paralleled Greek religion and consisted of multiple gods with human flaws interacting with the world and each other.
to teach their religion
Muhammed (pbuh) taught his religion which was Islam.
what is a place where the Franciscans opened to teach religion to American Indians
All religios teach their religion to their follower
religion and prophecy and culture.
Catholism
Christianity