When did Christian religion start?

Answer 1

When Christ first began his miracles, he had a small group of people, who the world call his disciples. That's just about when the religion started, but it took off again around the time of the Protestant Reformation.

Answer 2

It started after the death and resurrection of Christ. And people followed Jesus last command Go and make disciples.

Answer 3

technically, since the beginning of the earth. it was always gods plan to have jesus atone for our sins and the prophets of old knew this and believed he would come