This is the only Scripture I can find that you posted that has the word "granted" in it.
I'm pretty sure you are not understanding it correctly. As I read this, "granted" means that AFTER the Gentiles "repented/turned to God" based on the Covenant of Grace, He granted/accepted them into His family as "adopted" children of the Promise. The repentance was not a "gift," Gods MERCY IS THE GIFT.
Could be wrong in the context that all things are a "gift" from God. Life, breath, thought, growth, happiness, and everything else........so, in that context, one can say that "repentance" is a gift from God I suppose.
However, in the 4th Chapter of Matthew when Jesus first preaches, He calls for man to "repent." This is something that man does, and while those who do not believe in free will will argue differently, he does of his own free will. Choosing to turn to God, to believe in Jesus and to become a child of God and an adopted heir to the Promise............
Anyway, my thoughts, God bless