Everything we need to know about salvation and our daily walk with Christ is in the Scriptures. Christ told us that Himself.
"It is the spirit that quickeneth; the flesh profiteth nothing: The words that I speak unto you, they are spirit, and they are life." -- John 6:63
No doubt Christ said many things that are not in the Bible. And if any of them were necessary for our salvation, God would have inspired the writers of the Scriptures to include them.
He didn't.
Need to know and “good to know” are not mutually exclusive. Because something isn’t necessary, doesn’t make it un-scriptural or “jangling” or whatever term you use.
If salvation is the ultimate goal (which it is), and “Everything we need to know about salvation and our daily walk with Christ is in the Scriptures,” why did you bother going to school or educating your children? I mean, if all you need for salvation is in the Bible - and nothing else is of value - why are you even preaching? Just hand out the Good Book, lock the church doors and everyone go home.
Your position is absurd. It defies the Natural Law, and therefore defies God’s very essence.