No, the Holy Spirit does not become irrelevant.
If all answers are in the bible.. what use is the Holy Spirit?..
Jesus said go to the HS for answers not the bible..
Its true other bible lore writers said or implied that all useful knowledge was contained therein..
But that is merely their opinion.. their opinion is theirs..
“All scripture is God breathed”- is an opinion..
and a wonderful metaphor... not to speak of prose..
which raises the question does God breathe.?.. but I will table that meme.. for this discussion..
Is salvation possible for those that cannot read?...
Can the stupid be redeemed?..
I was a genius when I was 20.. but have grown progressively stupider over the years... Thank God..
Could you cite us another source that tells us about our need for a savior and how to recognize Him. and what He did for us?
Or does whatever spirit that is whispering in your ear tell you?