If you accept the teachings recorded in the Bible, then you also accept Tradition. In Matt. 2:23, for example, the prophecy "He shall be a Nazarene" is oral tradition. It is not found in the Old Testament. This demonstrates that the apostles relied upon oral tradition and taught by oral tradition. Again, in 1 Cor. 10:4, Paul relies on the oral tradition of the rock following Moses. It is not recorded in the Old Testament. See Exodus 17:1-17 and Num. 20:2-13.
In Mark 3:14; 16:15, Jesus commands the apostles to preach (not write) the gospel to the world. Jesus gives no commandment to the apostles to write, and gives them no indication that the oral apostolic word he commanded them to communicate would later die in the fourth century. If Jesus wanted Christianity to be limited to a book (which would be finalized four centuries later), wouldn't He have said a word about it?
EO and RCs both cling to tradition, yet each considers the other schismatic.
The Orthodox and Catholic Churches are separated; neither views the other to be in schism.
So whose tradition is correct?