God even promised (Genesis 12:1-3) : "The LORD had said to Abram, “Go from your country, your people and your father’s household to the land I will show you. I will make you into a great nation, and I will bless you; I will make your name great, and you will be a blessing. I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you."
Then, who blesses Israel, is blessed by God!
Who curses Israel, is cursed by God!
Who is against Israel, is against God!
Who is in favor of Israel, is in favor of God!
We are decedents of Abraam, Christians by the Holy Spirit of God and Jews through the blood, we are blessed by God.