The first Christian meetings were held in homes of followers of Jesus, right after the crucifixion and resurrection of Jesus. Christianity was accepted when the Roman Emperor Constantine became a Christian.  The split between the Orthodox and Catholic churches occurred over whether the Church at Rome had authority over all other branches; and, over whether the Holy Spirit came forth from the Father (Orthodox position) or equally from the Father and Son (Catholic position).  The Protestant split came about with Martin Luther's 95 Theses or differences with the Church, chiefly over indulgences, but also over whether salvation was solely by faith or whether some degree of works was required.