Water baptism, attending church, singing songs, giving money, none of these save you. You cannot be saved except by the blood of Jesus. Look at communion. We have that one backwards. We take it as special sacrament at services only, but the word communion itself tells us something else.
Communion means to be partners, to be intimate with, to fellowship.
We are to do all things in remembrance of Jesus, not just when we come together at service. That was part of what He came to fulfill. He came to bring all of God to all of us, not a part to a few. The account of the institution of this ordinance is given in Matt. It is not mentioned by John.