The differences is without a doubt truly glaring, that one wonders what the missionary excuse will be since we have seen the above contradiction.

"Abraham took another wife, whose name was Keturah. She bore him Zimran, Jokshan, Medan, Midian, Ishbak and Shuah. Jokshan was the father of Sheba and Dedan; the descendants of Dedan were the Asshurites, the Letushites and the Leummites. The sons of Midian were Ephah, Epher, Hanoch, Abida and Eldaah. All these were descendants of Keturah. Abraham left everything he owned to Isaac. But while he was still living, he gave gifts to the sons of his CONCUBINES and sent them away from his son Isaac to the land of the east. Altogether, Abraham lived a hundred and seventy-five years. Then Abraham breathed his last and died at a good old age, an old man and full of years; and he was gathered to his people. His sons Isaac and Ishmael buried him in the cave of Machpelah near Mamre, in the field of Ephron son of Zohar the Hittite, the field Abraham had bought from the Hittites. There Abraham was buried WITH HIS WIFE SARAH. After Abraham's death, God blessed his son Isaac, who then lived near Beer Lahai Roi." Genesis 25:1-11

"‘As for me, this is my covenant with you: You will be the father of many nations. No longer will you be called Abram; your name will be Abraham, for I have made you a father of many nations. I will make you very fruitful; I will make nations of you, and kings will come from you. 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 are now an alien, I will give AS AN EVERLASTING POSSESSION to you and your descendants after you; and I will be their God’ ... God also said to Abraham, ‘As for Sarai your wife, you are no longer to call her Sarai; her name will be Sarah. I will bless her and will surely give you a son by her. I will bless her so that she will be the mother of nations; kings of peoples will come from her.’ Abraham fell facedown; he laughed and said to himself, ‘Will a son be born to a man a hundred years old? Will Sarah bear a child at the age of ninety?’ And Abraham said to God, ‘If only Ishmael might live under your blessing!’ Then God said, ‘Yes, BUT your wife Sarah will bear you a son, and you will call him Isaac. I WILL ESTABLISH MY COVENANT WITH HIM AS AN EVERLASTING COVENANT FOR HIS DESCENDANTS AFTER HIM. And as for Ishmael, I have heard you: I will surely bless him; I will make him fruitful and will greatly increase his numbers. He will be the father of twelve rulers, and I will make him into a great nation. BUT MY COVENANT I WILL ESTABLISH WITH ISAAC, WHOM SARAH WILL BEAR TO YOU BY THIS TIME NEXT YEAR.’" Genesis 17:4-8, 17-21

"But Sarah saw that the son whom Hagar the Egyptian had borne to Abraham was mocking, and she said to Abraham, ‘Get rid of that slave woman and her son, for that slave woman's son will never share IN THE INHERITANCE WITH MY SON ISAAC.’ The matter distressed Abraham greatly because it concerned his son. But God said to him, ‘Do not be so distressed about the boy AND YOUR MAIDSERVANT. LISTEN TO WHATEVER SARAH TELLS YOU, BECAUSE IT IS THROUGH ISAAC THAT YOUR OFFSPRING WILL BE RECKONED. I will make the son of THE MAIDSERVANT into a nation also, because he is your offspring.’" Genesis 21:9-13

And verily, there came Our Messengers to Abraham with glad tidings. They said: Peace! He answered, Peace! and he hastened to entertain them with a roasted calf. But when he saw their hands went not towards it (the meal), he felt some mistrust of them, and conceived a fear of them. They said: ‘Fear not, we have been sent against the people of Lot.’ And HIS WIFE was standing (there), and she laughed. But We gave her glad tidings of Isaac, and after him, of Jacob. They said: ‘Do you wonder at the Decree of Allâh? The Mercy of Allâh and His Blessings be on you, O the family [of Abraham]. Surely, He is All-Praiseworthy, All-Glorious.’" S. 11:69-73

"Has the story reached thee, of the honored guests of Abraham? Behold, they entered his presence, and said: ‘Peace!’ He said, ‘Peace!’ (and thought, ‘These seem) unknown people.’ Then he turned quickly to his household, brought out a fatted calf, And placed it before them. He said, ‘Will ye not eat?’ (When they did not eat), He conceived a fear of them. They said, ‘Fear not,’ and they gave him glad tidings of a son endowed with knowledge. But HIS WIFE came forward clamoring: she smote her forehead and said: ‘A barren old woman!’ They said, ‘Even so has thy Lord spoken: and He is full of Wisdom and Knowledge.’" S. 51:24-30

Narrated Abu Huraira:

Allah's Apostle said, "The Prophet Abraham migrated with Sarah. The people (of the town where they migrated) gave her Ajar (i.e. Hajar). Sarah returned and said to Abraham, "Do you know that Allah has humiliated that pagan and he has given A SLAVE-GIRL FOR MY SERVICE?" (Sahih Al-Bukhari, Volume 3, Book 47, Number 803)

Narrated Abu Huraira:

Abraham did not tell a lie except on three occasion. Twice for the Sake of Allah when he said, "I am sick," and he said, "(I have not done this but) the big idol has done it." The (third was) that while Abraham and Sarah (his wife) were going (on a journey) they passed by (the territory of) a tyrant. Someone said to the tyrant, "This man (i.e. Abraham) is accompanied by a very charming lady." So, he sent for Abraham and asked him about Sarah saying, "Who is this lady?" Abraham said, "She is my sister." Abraham went to Sarah and said, "O Sarah! There are no believers on the surface of the earth except you and I. This man asked me about you and I have told him that you are my sister, so don't contradict my statement." The tyrant then called Sarah and when she went to him, he tried to take hold of her with his hand, but (his hand got stiff and) he was confounded. He asked Sarah. "Pray to Allah for me, and I shall not harm you." So Sarah asked Allah to cure him and he got cured. He tried to take hold of her for the second time, but (his hand got as stiff as or stiffer than before and) was more confounded. He again requested Sarah, "Pray to Allah for me, and I will not harm you." Sarah asked Allah again and he became alright. He then called one of his guards (who had brought her) and said, "You have not brought me a human being but have brought me a devil." The tyrant then gave Hajar AS A GIRL-SERVANT TO SARAH. Sarah came back (to Abraham) while he was praying. Abraham, gesturing with his hand, asked, "What has happened?" She replied, "Allah has spoiled the evil plot of the infidel (or immoral person) AND GAVE ME HAJAR FOR SERVICE." (Abu Huraira then addressed his listeners saying, "That (Hajar) was your mother, O Bani Ma-is-Sama (i.e. the Arabs, the descendants of Ishmael, Hajar's son)." (Sahih Al-Bukhari, Volume 4, Book 55, Number 578; see also Volume 3, Book 34, Number 420)