The earliest Christians in Jerusalem and Antioch had not one word of the New Testament. Their faith came not from study of sacred texts but from the oral witness of the apostles. The bible itself testifies that it is possible to be fully Christian without any of the New Testament as an Owner’s Manual. The protestant American view of the bible as the indispensible “Christian Instructions” in which everything can be looked up, is dangerous to the faith. Not to mention being unbiblical.
The early believers actually did have scripture, the Old Testament, as well as instruction from the apostles. You are right that believers do not need the Bible to be saved, but what’s your point? Why do believers around the world risk martyrdom for portions of scripture? It’s because…
2 Timothy 3:16
New King James Version
16 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for [a]instruction in righteousness,
Reading scripture is not “dangerous” to the faith.