Used to refer to someone that preaches a cause with devotion to the topic. Taken from the use of the word Evangelist to refer to someone that preached the good work of the protestant church, usually in the form of a missionary.

Got the covid-19 vaccine

A person making a sad attempt to spread the word of their religion through the internet and cyberspace.

Usually reffered to define a religious creed, it can also be used in Italy to define a Homosexual with phsychiatric problems