You are the one who said “The writings of those who knew Christ and were taught by Christ are the only way of conforming to Christ’s teachings.” I’m glad to see you retract that statement.
I think you are trying to make too fine a point for some reason. Of course someone can be saved without by hearing of Christ alone. Scripture is the standard by which someone knows whether or not what is being told confirms to Christ’s teachings.
This thread seems to be turning into some not-so-Christian Catholic versus Protestant argument. Faithful Christians can be found on both sides, and that opinion is backed by scripture. But if anyone comes to me and tells me something directly contradicted by scripture, then they are not in accordance with Christ’s teachings. That’s because scripture is what it claims to be, God inspired and suitable for correcting others.