Romans 1:16

I am understanding your question to be in connection with Romans 1:16 – “For I am not ashamed of the gospel, because it is the power of God that brings salvation to everyone who believes: first to the Jew, then to the Gentile.”

A starting point is keeping in mind that the content of John 3:16 is not a truth restricted to the New Testament. No, God has always loved all the people of the world. While God promised and sent a Savior for all the people of the world, God made those promises to and fulfilled those promises through the people of Israel, the Jews. For that reason, the gospel message needed to be shared especially with the Jews, but not to the exclusion of Gentiles.

Jesus demonstrated that close connection between God’s plan of salvation and the Jewish people when he spoke of his ministry being directed “only to the lost sheep of Israel” (Matthew 15:24), when he reminded the Samaritan woman that “salvation is from the Jews” (John 4:22) and when he instructed his followers to spread his word (Luke 24:47; Acts 1:8).

The phrase in your question references the people through whom God fulfilled all the promises of the Savior. It does not speak of a God who shows favoritism (Acts 10:34-35; Romans 2:11).