The importance of knowing New Testament Greek

[I.Clarify]

a manuscript or musical score in an author's or musician's own handwriting.
a person's handwriting.

[hermonymusofsparta]

This is false. Not a single verse of Scripture implies this and every verse in the Bible that speaks on scripture or inspiration directly contradicts this idea.

2 Timothy 3:15-16 KJV
And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. [16] All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:

There are no original copies today and there were none in Paul's day (except for his own). The originals are gone. God preserved His word and it's still inspired.