That is a week argument. For instance. NT quotes other writings it may be the entire work is not inspired. However, the quote for use in the text certainly is. Thus we can say at least 2 Macc. 7 is inspired because that is what we can agree inspired text is referred to Yet you cannot dismiss out of hand the entire book.
The apostles themselves knew which Scriptures were inspired and which were not. They knew when "the Holy Spirit was speaking to them as per the Word of God.
For example, Paul wrote as many as four epistles to the Corinthians. Only two are inspired. Why not the other two. Was it the decision of Paul, or fallible men. It was the decision of God the Holy Spirit who directed Paul's hand in writing down those words. I believe Paul knew which books would be inspired, and I believe Peter knew which ones were inspired, as he refers to them in 2Pet.3:
And account that the longsuffering of our Lord is salvation; even as our beloved
brother Paul also according to the wisdom given unto him hath written unto you; As also in
all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest,
as they do also the other scriptures, unto their own destruction. (2 Peter 3:15-16)
The apostles were not so naive that they did not know when God was speaking to them. Compare to the OT, when the prophets spoke. They were not so naive that when they stood up and said: "Thus saith the Lord," it was God speaking. And so it was with the apostles.
Also:
Jude quotes Enoch, but that doesn't make the entire book of Enoch inspired, only that portion that is quoted by Jude.
Paul quotes a Greek poet in Acts 17. (Does that mean that all Greek poetry is inspired?)
Paul quotes a Cretian philosopher in Titus 1. Does that mean that all Cretian philosophers are inspired?
Just because a book is quoted or referred to does not make it inspired.
You must agree btw the NT quotes that passage at least that passage is inspired. As for the rest of the book it is up for debate and the most you can say is that it is partly inspired. But to dismiss out of hand is a mistake. You cannot use this type of reasoning for Paul's Greek philosophy quote because he's not saying his quote is inspired but was a comparitive passage.
That particular passage is now part of the inspired word of God, and therefore is inspired.
Hebrews does not refer to 2 Macc. in the same sense. It places the passage in the "hall of faith" of inspired people who did God's will.
I don't know that Hebrews does refer to Maccabees.
Even as Jude quotes a text insisting of the disposal of Moses body which the 39 books doesn't even touch. However, since it is in agreed scripture or the book of Jude at least that aspect is inspired.
Yes, because it is in the Book of Jude it is inspired. God revealed it to Jude, the half brother of Jesus. Why would that be difficult to believe?