[kawaii]

??? How are men to believe if not by reading the word of God and being led by the Holy Spirit?

Well considering that Holy Scripture in written form was rare and expensive until fairly recently not to mention most folks in the early church couldn't read it if they'd wanted to and could afford it. I suspect that reading scripture is not a requirement for salvation.

[Mad Dawg]

Paul addresses the question of how poeple come to faith: Pas gar hos an epikalesetai to onoma kuriou sothesetai.
Pos oun epikalesontai eis hon ouk episteusan;
pos de pisteusosin hou ouk ekousan;
pos de akousosin xwris kerussontos;
pos de keruxosin ean me apostalosin;

It sounds to me like Paul in Romans says that listening to Apostles -- those sent -- is a critical part of coming to call on the Lord. AS near as I can tell, the Bible suggests listening to those who are sent.

[Dr. Eckleburg]

considering that Holy Scripture in written form was rare

The apostles referenced the Old Testament many times. The word of God, whether it is preached or written in Scripture, is the same forever.