The liturgy preceded the Scriptures. We know this because the Apostles were offering the Eucharist before many of the New Testament books books of the Bible were even written, let alone compiled. For example, St. Luke describes...
Acts 2:46: "...
they continued, daily, to be of one accord in the temple and
to break bread among the houses."
1 Cor 11:23: "...For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed
took bread..." Here St. Paul describes the Eucharistic sacrifice being offered in Corinth.
The new covenant (testament) was established the evening before the Cross, on Holy Thursday in the Upper Room. Here is our Blessed Lord instituting it...
"And as ttey were eating, Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, 'Take, eat; this is my body.' And he took the cup, and gave thanks, and gave it to them, saying, 'Drink ye all of it;
For this is my blood of the new testament, which is shed for many for the remission of sins.'" (Mt. 26:26-28)
"And as they did eat, Jesus took bread, and blessed, and brake it, and gave to them, and said, 'Take, eat: this is my body.' And he took the cup, and when he had given thanks, he gave it to them: and they all drank of it. And he said unto them, '
This is my blood of the new testament, which is shed for many'." (
Mark 14:22-24)
"And he took bread, and gave thanks, and brake it, and gave unto them, saying, 'This is my body which is given for you: this do in remembrance of me.' Likewise also the cup after supper, saying, '
This cup is the new testament in my blood, which is shed for you.'" (
Luke 22:19-20)
Here is St. Paul
quoting our Blessed Lord, "For I have received of the Lord that which also I delivered unto you, that the Lord Jesus the same night in which he was betrayed took bread: And when he had given thanks, he brake it, and said, 'Take, eat: this is my body, which is broken for you: this do in remembrance of me.' After the same manner also he took the cup, when he had supped, saying, '
This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.'" (1 Cor 11:23-25)
Your liturgy is not God's word. You may use and incorporate God's within your liturgy, but you have a liturgy, whether you admit it or not and it is not just "God's word." The difference is your liturgy is something entirely novel and made up. This again is why if you took a time machine and transported back to the Church of antiquity, what you would experience would be completely alien and foreign to you. You would be a stranger to it because the faith of the ancient Christians is not the faith you profess. It is the reason why you would even have to ask why a church has an altar in it. The churches of ancient Antioch, Jerusalem, Athens, Alexandria and Rome were built to celebrate the Christian liturgy. Their faith is not your faith.