To be enthusiastic about something, and to attempt to share that enthusiasm with others; to promote.
To preach any ideology to those who have not yet been converted to it.
Coordinate term: proselytize
To tell people about (a particular branch of) Christianity, especially in order to convert them; to preach the gospel to.
Hypernym: proselytize
To speak in a patronizing, supercilious or pompous manner, especially at length.
To preside as a bishop, especially at mass.
To act like a pontiff; to express one's position or opinions dogmatically and pompously as if they were absolutely correct.
The status or term of office of a pontiff or pontifex.