“I will make you very fruitful. . . . I will establish my covenant as an everlasting covenant between me and you and your descendants after you for the generations to come, to be your God and the God of your descendants after you. The whole land of Canaan, where you now reside as a foreigner, I will give as an everlasting possession to you and your descendants after you.”
Early chapters of the Bible are revelation of prophet Moses(as) and he and his followers (the people of Israel) had been informed by God Almighty not only about past and previous prophets but also about future and next coming prophets. The existed Old Testament does not possess exactly the same Words of God Almighty as had been revealed to prophet Moses(as) . It is a fact that later coming followers added their own words and explanations in this revelation but a reader can find revealed words that proved their truth by the test of time. We read in the Bible that God Almighty made many promises with prophet Abraham(as) and with his seed:
”And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing … and in thee shall all families of the earth be blessed ”(Genesis 12:2-3).
God Almighty says about both sons of Abraham; Ishmael and Isaac (Genesis 17:20-22): ”And as for Ishmael, I have heard thee (refers to Abraham’s prayer in Genesis 17:18—“O that Ishmael might live before thee”): Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation. But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year. And he left off talking with him, and God went up from Abraham”.
And we also read in the Bible about external sign of this covenant of spiritual blessings that is the practice of circumcision: (Genesis 17:9-11): ”And God said unto Abraham, Thou shalt keep my covenant therefore, thou,and thy seed after thee in their generations. This is my covenant which ye shall keep, between me and you and thy seed after thee; Every man-child among you shall be circumcised. And ye shall circumcise the flesh of your foreskin;and it shall be a token of the covenant betwixt me and you.
From these quotations it is obvious that Abraham had promise for his both sons, Ishmael and Isaac, Ishmael being the elder and Isaac the younger. (Genesis 21:21):” And he dwelt in the wilderness of Paran: and his mother took him a wife out of the land of Egypt”. God promised Abraham that He would multiply and bless his progeny. The land of Canaan was given over to the sons of Abraham, and that the external sign of the covenant which God made with Abraham was circumcision of all males. All these promises were fulfilled. The progeny of Isaac multiplied exceedingly. From among them arose the great Prophets like Moses, David, Ezekiel, Daniel and Jesus etc.. For two thousand years the people of Israel ruled over Canaan. Their hold on it was never really abolished, though for a short time it became weak.
After the seventh century A.D., however, the sons of Isaac, and those who observed the letter of the Law of Moses had to withdraw from Canaan. The sons of Ishmael, instead, became its political as well as its spiritual leaders. The fact that the sons of Israel had to surrender the land of Canaan shows the time of the fulfilment of the other promise (which God had made with Abraham about his son other Ishmael) started by the advent of Prophet of Islam and his revelation. He was descendant of Abraham from Ismael.
This covenant of spiritual Blessing of God, in its first part, was confine to the generation of Isaac but after prophet of Islam it had become universal through the progeny of Ismail . The other part of the covenant of God Almighty He made with Abraham : ”and in thee shall all families of the earth be blessed ”(Genesis 12:3) started in the person of Mohammad (prophet of Islam). He was descendant of Abraham (from Ismael) and he was given a universal message for all mankind.
This covenant of God to Abraham that all nations of the world will be blessed through his generation fulfilled through the universal revelation of the Quran. Its message calls all nations to its message as Prophet of Islam was ordered by God Almighty: ( Quran 7:159): ”Say, ‘O mankind! truly I am a Messenger to you all from Allah to Whom belongs the kingdom of the heavens and the earth. There is no God but He. He gives life, and He causes death. So believe in Allah and His Messenger, the Prophet, the Immaculate one, who believes in Allah and His words; and follow him that you may be rightly guided.”
This promise of spiritual blessing of Abraham after the advent of Islam became universal and circumcision ; the external sign of receiving spiritual blessings was also adopted by all nations of the world who accepted Islam. It is the reason that all followers of Islam in the whole world who belong to different nations also practice circumcision as a religious practice to follow the order of God Almighty that he gave to prophet Abraham.
Source : http://www.patheos.com/blogs/crossexamined/2018/04/the-bible-story-reboots-have-you-noticed/930