I draw pretty sharp distinctions on this topic, so yes, men of the "Church", penned the words and ideas. I just hold that those ideas came directly from God. In my mind there is way too much cohesiveness in the NT for the books to have been written independently, rather than under a divine inspiration.
It is now clear that unbelievers recognized that the authority of the Church depends on the Bible, that if they can discredit the Scriptures, they can discredit the Church.
That sounds reasonable.
The modern gnostics are trying to persuade the public that the "lost gospels" are as authentic, or more so than the canonized gospels, They claim that they were suppressed after Constantine adopted Christianity as the State religion.
The Gnostics would have to explain what they think the Spirit's role was in assembling the NT. They would have to say "none". If I am following your overall point, though, I would certainly agree that Catholicism was the dominant faith within Christianity at the time, and always has been in terms of numbers (as far as I know).
The Spirit works through men, and their natural gifts which they owe to God. What they heard from Jesus, what he heard about Jesus from the Apostles, is the truth and that is what is written.