I said, "Scripture has the minimum necessary for belief and how to save oneself, but also in Scripture we read that the apostle, John, acknowledged that not everything Jesus did was written."
In other words, Scripture, or The Bible, has the minimum necessary for belief and the salvation of hearts. Am I saved? No one will know if their reward is Heaven or not until after their life has ended here on Earth. However, we do know what the road to Heaven requires, and that is perseverance in faith, hope, and love until our last breath.
At the same time, Scripture is an incomplete knowledge of Jesus, and of God in general. No one book could contain all there is to know about the eternal One, nor all that He has to say. Therefore, I believe it'd be wrong for anyone to assume that God wouldn't continue to choose spokespersons and reveal knowledge to them for all humanity. Yes, there are those who make false claims, but that's why Scripture says we must examine everything, hold to what is good, and refrain from what is evil, and that we shall know them by their fruits, and a good tree cannot bear evil fruit, etc.