Why are some sects of Christianity more aggressive with conversion than others?

Question

I was reading another reddit post all about Christianity. In it, some of the posters were conversing on how evangelistic sects are more aggressive than Catholic Church is in converting non believers. This has made me wonder why this is. Why are some sects, like evangelists and Jehovah's Witnesses, more focused on conversion than sects like the Catholics, and Eastern and Oriental Orthodox?

Answer 1

I would point you towards the Protestant Reformation in which denominations broke away from the Catholic Church and started anew: anabaptists, etc. Here there was an importance to make sure their denominations could survive and prosper and this led to seeking higher conversions rates. From a spiritualistic standpoint, the Gospel teaches acceptance of Jesus Christ as the only way to salvation. Up until Vatican II, the Catholic Church claimed it was the "one true Church" as it has claims to being the original church. After Vatican II, the Catholic Church claims it has the best claim on salvation but not the only way anymore. Protestants are more worried about making sure all people convert to Christianity due to their beliefs in the validity of the text. Not all Protestant denominations push for conversion the way others do, but it boils down to beliefs. Additionally, the Catholic Church still holds a majority of the world. In the past, its missionary efforts far outreached those of Protestants during ages of colonization of entire countries.