Why then the law? It was added because of transgressions, until the offspring should come to whom the promise had been made, and it was put in place through angels by an intermediary. Now an intermediary implies more than one, but God is one.
Why did God give us the law, if the law is insufficient to save us?
Why put pressure on a gunshot wound, when the victim is still on the way to the hospital?
The law was a temporary solution. Left to ourselves, when the time was not right for God to send His Son, we would bleed to death. We would show our true selves, and suffering and evil would increase exponentially. The law was added because we by nature are vile sinners. It was pressure on the wound, until the coming of the Son, the offspring promised to Abraham through which salvation would come.
The law was put into place through angles by a go-between between man and God (The Holy Spirit?)
Ah! More confusion about the Holy Spirit! And I admit, I don't understand it all. How can the Spirit be God, and yet intercede for us with God? Yet I believe He does.
Sorry I can't be more enlightening today. Perhaps you can chew on it a while and render some insightful comments.