Do you happen to know what the Sacred Traditions are? Is there a list somewhere that we can look at?
Read ECF, Ignatius of Antioch, Iranaeus. These all existed before the finalized version of OT and NT.
*St. Ignatius of Antioch
Also called Theophorus (ho Theophoros); born in Syria, around the year 50; died at Rome between 98 and 117.
It is also believed, and with great probability, that, with his friend Polycarp, he was among the auditors of the Apostle St. John. If we include St. Peter, Ignatius was the third Bishop of AntiochSt. John Chrysostom lays special emphasis on the honor conferred upon the martyr in receiving his episcopal consecration at the hands of the Apostles themselves (“Hom. in St. Ig.”, IV. 587).
To decide this question one has only to examine the oldest Liturgies of the Mass, whose essential elements date back to the time of the Apostles (see articles on the various liturgies), to visit the Roman Catacombs, where Christ is shown as present in the Eucharistic food under the symbol of a fish (see EARLY SYMBOLS OF THE EUCHARIST), to decipher the famous Inscription of Abercius of the second century, which, though composed under the influence of the Discipline of the Secret, plainly attests the faith of that age. And thus the argument from prescription carries us back to the dim and distant past and thence to the time of the Apostles, who in turn could have received their faith in the Real Presence from no one but Christ Himself. *
newadvent.org/cathen/07644a.htm
*On the Eucharist, Ignatius wrote in his letter to the Smyrnaeans:
“ Take note of those who hold heterodox opinions on the grace of Jesus Christ which has come to us, and see how contrary their opinions are to the mind of God. . . . They abstain from the Eucharist and from prayer because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ, flesh which suffered for our sins and which that Father, in his goodness, raised up again. They who deny the gift of God are perishing in their disputes. — Letter to the Smyrnaeans 6:2–7:1 ” *
en.wikipedia.org/wiki/Ignatius_of_Antioch
There is no list, Sacred Tradidition is ALL of what early Christians practiced. It would be impossible to cite them all here, which is why I provided links. Please read them.