The faith being delivered to the saints did not mean Christ lost possession of the faith.
The word is also used when Paul delivered to the Corinthians that which he also received.
By delivering it to the Corinthians Paul did not give up ownership of that which he delivered.
"For I delivered to you, first of all, that which also I received, that Christ died for our sins according to the Scriptures ... etc. etc."
The word "up" in "delivered up"
in First Corinthians 15:24
may be omitted. Then it would read -
"He shall deliver the kingdom to God, even the Father ..."
as in these English translations
English Standard Version
Then comes the end, when he delivers the kingdom to God the Father after destroying every rule and every authority and power.
Aramaic Bible in Plain English
And then the end will come, when he will deliver The Kingdom to God The Father, when he will destroy every Ruler and every Authority and all Powers.
Since Christ dominion is an eternal one (Dan. 7:14)
his delivering the kingdom is not relinquishing possession of His kingdom.
Since He is the possessor of "the eternal kingdom of our Lord and Savior Jesus Christ" (2 Pet. 1:11)
He does not "deliver UP" as in lose ownership. Rather He delivers to His God and Father and it remains His eternal possession.
Many translations say "hand over"
to God the kingdom. Again paradidomi
does not have to mean cessation of ownership in the delivering of something.
Assistance for this post I derived from The Last Assize
by G.H. Lang, published by Conley and Schoettle Publishing. The chapter title was "God All And All"
beginning on page 56.