Read part of what John Stott wrote about Galatians 4:4-5-
But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons. - Galatians 4:4-5
What is emphasized in these verses is that the one whom God sent to accomplish our redemption was perfectly qualified to do so. He was God's Son. He was also born of a human mother, so that He was human as well as divine, the one and only God-man. And He was born 'under the law', that is, of a Jewish mother, into the Jewish nation, subject to the Jewish law. Throughout His life He submitted to all the requirements of the law. He succeeded where all others before and since have failed: He perfectly fulfilled the righteousness of the law. So the divinity of Christ, the humanity of Christ and the righteousness of Christ uniquely qualified Him to be man's redeemer. If he had not been man, He could not have redeemed men. If He had not been a righteous man, He could not have redeemed unrighteous men. And if He had not been God's Son, He could not have redeemed men for God or made them the sons of God.