I believe that your argument is pure philosophy. There reason I say this is:Scripture is given to the entire world. It is beneficial to God's children as the Holy Spirit gives counsel. It is often misused and twisted by those enslaved to Satan.
1 Timothy 3:16-17 tells us...
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
God doesn't give Himself to the unredeemed. To them He casts out unto eternal damnation.
God is the I Am. He is not a gift (object) given to men that they might possess Him.
The elect are objects upon which he chooses to bestow his gift of grace and Redeem from their unrighteousness. He places these redeemed sinners into Christ Jesus, our Redeemer.
Nowhere that I know of in scripture is God called a gift to humanity. JonC, you are making a purely philosophical argument.
By virtue of His essence, God is greater than all things. But, the question is, what is the greatest gift, not who is the greatest being. This is why I think your argument is incorrect. You are attempting to move the goalpost.
1. You deny the greatest gift to humanity is Christ. But Scripture testifies to the contrary. Even those who are not saved have their existence through Him. They "hold together" through Him. Scripture tells us that the greatest gift is love, that God is love, that God sent His Son to the world to save those who believe as an act of love. Scripture tells us that this is the greatest. But no passage, only your "reasoning" concludes that Scripture is the greatest gift to mankind.
2. Scripture is not given to the world. Scripture was given to the people of God.
3. Even if we look only at the gospel it is foolishness to those who are perishing.
4. You misquote Scripture to prove a point. How can Scripture be the "greatest" gift to humanity if it is so easily twisted to serve a philosophical argument?
2 Timothy 3:16-17: All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; so that the man of God may be adequate, equipped for every good work.
Romans 15:4-6 For whatever was written in earlier times was written for our instruction, so that through perseverance and the encouragement of the Scriptures we might have hope. Now may the God who gives perseverance and encouragement grant you to be of the same mind with one another according to Christ Jesus, so that with one accord you may with one voice glorify the God and Father of our Lord Jesus Christ.
5. You are inconsistent. You deny God as the greater gift because of those who will not be saved. But at the same time you seem to argue that Scripture is given to those who cannot benefit from Scripture.
God gives Himself to Humanity, to Mankind. That is the gospel itself. To ignore this is, IMHO, to miss the point of Christ's work.
Your error is due, I believe, to relying on Calvinism as a philosophy rather than a soteriology. It has colored your thinking to the point that you do not see Scripture is given for the purpose of equipping and teaching the man of God but the whole world. You do not seem to see Scripture is given for OUR instruction so that WE might be encouraged to have hope but seem to think that it is given to the world so that somehow the lost have a hope not coupled with perseverance.