6 So also Abraham “believed God, and it was credited to him as righteousness.” 7 Understand, then, that those who have faith are children of Abraham. 8 Scripture foresaw that God would justify the Gentiles by faith, and announced the gospel in advance to Abraham: “All nations will be blessed through you.”9 So those who rely on faith are blessed along with Abraham, the man of faith.
How does one become child of Abraham? One needs to turn back to Genesis 17: the founding of circumcision. In Galatians 3:6 Paul cites Genesis 15:6: “Abram believed the LORD, and he credited it to him as righteousness.” Circumcision will not make one child of Abraham, but assenting to God’s promises, like the archfather did, would. The apostle even thinks of Genesis 12. When God called Abram, he foresaw that “persons from every tribe and language and people and nation.” (Rev. 5:9) would consider themselves the offspring of the patriarch.
It is a chorus in the first book of the bible and the whole of the Old Testament. Ages in advance did God have the Celts, as well as many others, in mind to be his own children. Together with everyone who would believe in Jesus Christ: God’s Son, long before father Abraham was born (John 8:58).
Was Abraham a (reformed) protestant? A book with that title exists. The Kur’an states that he was neither Jew, nor a Christian, but a Muslim. According to Muhammad’s followers the adherents of all three Abrahamic religions would become brothers if all would agree about Allah’s childlessness. But the world would only truly receive peace when Jews, Christians and Muslims would bow together for the Son of the Father, who became THE child of Abraham. Through his crucifixion he made Abraham’s children to be God’s very own brood.
The God of Abr’ham praise
At whose supreme command
From earth I rise and seek the joys at His right hand;
I all on earth forsake, it’s wisdom, fame and pow’r;
And Him my only Portion make
My Shield and tow’r