Proselytism is the policy of attempting to convert people's religious beliefs. Carrying out attempts to instill beliefs can be called proselytization.
A Christian proselytizer trying to spread his faith in London, England, 1970
Statue of St. Patrick of the Celtic Church, who was famous for proselytizing
Evangelism, evangelisation, or witnessing, is the act of sharing the Christian gospel, the message and teachings of Jesus Christ. It is typically done with the intention of converting others to Christ
Proselytism
…out attempts to instill beliefs can be called proselytization. Proselytism is illegal in some countries. Some draw distinctions between Christian evangelism and proselytism, regarding proselytism as involuntary or coerced; the two terms can also be understood to merely be synonyms. The English-language word…
Billy Graham in Düsseldorf (1954)
World Youth Day, an evangelistic event, in Copacabana, Rio de Janeiro, Brazil, in 2013.
Passion Conferences, a music and evangelism festival at Georgia Dome in Atlanta, Georgia, United States, in 2013