The offering of sacrifice to God. This involved the offering and partaking of various animal and bird offerings in the Old Testament, the Lamb of God in the New Testament and the sacrifice of the mass in the Catholic Church.
Wherever two or three were gathered together in his name.Well when you said, "did" I think you mean "still do" because Christianity (of course) is still around. We worship anywhere, anytime, anymood.
Traditionally, Christians go to Church for worship. Other Christians worship elsewhere such as in the home.
Acts 7:48 says, "The Most High dwelleth not in temples made with hands." And Matthew 6:6...