But take a step back, Alex. What do we need to know or do that is NOT in Scripture? What?
"What do we need to know or do that is NOT in Scripture?"
And let me add, if there is anything, remember
Gen. 2:18, "And the LORD God said, [It is] not good that the man should be alone; I will make him an help meet for him." they will be sure to tell us.
Off the top of my head, should infants be baptized? Should Sunday be day of worship? Should children receive Communion? Is adultery grounds for annulment? Are sins remitted at confession or upon completion of penance? What does it mean "pray without ceasing"? On all these different cases can be made from the scripture alone.
The praxis of the Church has been nearly entirely left to the Apostolic Tradition.