"So tell us..... What is so critical for salvation and maturity in Christ that the Holy Spirit neglected to include in Scripture that the Catholic church deems it necessary to teach it as truth?"
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For starters, the "Table of Contents" of the New Testament (i.e., exactly which letters, "gospels", and other writings of those days
did belong in the New Testament, and discernment about which letters, "gospels", and other writings of those days
did not belong in the New Testament). Such a list designating exactly which writings belong in the Holy Scriptures does not exist anywhere in the Holy Scriptures. That list is entirely external to the Holy Scriptures, and was determined by several "Councils of the Catholic Church", under the guidance of the Holy Spirit, who Jesus Christ promised would be with His Church forever:
"And I will pray the Father, and he will give you another Counselor, to be with you for ever." John 14:16
For starters,Ok; I've got the start part down.
Can you post the bottom line asked for??
"What is so critical for salvation and maturity in Christ that the Holy Spirit neglected to include in Scripture that the Catholic church deems it necessary to teach it as truth?"