Question for Muslim point of view (let's try this again...)?

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I’ve recently begun reading the Qu’ran and come across the following. Please keep in mind I haven’t read the entire book yet.

al-Baqarah

133 Or were ye present when death came to Jacob, when he said unto his sons: What will ye worship after me ? They said: We shall worship thy God, the God of thy fathers, Abraham and Ishmael and Isaac, One God, and unto Him we have surrendered.

Genesis 17

19 Then God said, "Yes, but your wife Sarah will bear you a son, and you will call him Isaac. [d] I will establish my covenant with him as an everlasting covenant for his descendants after him. 20 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. 21 But my covenant I will establish with Isaac, whom Sarah will bear to you by this time next year." 22 When he had finished speaking with Abraham, God went up from him.

From this we see that we both worship the same God (the God of Abraham) and that there were two sides to the first covenant. One with Isaac and one with Ishmael. Obviously these men were not Christians because the Christ hadn’t even been born yet. However, in your understanding of the following, would the new covenant of Christ make both sides of the older covenant obsolete? If not, is there a scriptural reference that explains why?

Old Testament:

Jeremiah 31:31

"The time is coming," declares the LORD, "when I will make a new covenant with the house of Israel and with the house of Judah.

New Testament:

Romans 7:6

But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code.

Romans 7:5-7 (in Context) Romans 7 (Whole Chapter)

2 Corinthians 3:6

He has made us competent as ministers of a new covenant—not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.

2 Corinthians 3:5-7 (in Context) 2 Corinthians 3 (Whole Chapter)

2 Corinthians 5

16So from now on we regard no one from a worldly point of view. Though we once regarded Christ in this way, we do so no longer. 17Therefore, if anyone is in Christ, he is a new creation; the old has gone, the new has come! 18All this is from God, who reconciled us to himself through Christ and gave us the ministry of reconciliation: 19that God was reconciling the world to himself in Christ, not counting men's sins against them. And he has committed to us the message of reconciliation. 20We are therefore Christ's ambassadors, as though God were making his appeal through us. We implore you on Christ's behalf: Be reconciled to God. 21God made him who had no sin to be sin[a] for us, so that in him we might become the righteousness of God.

Hebrews 9:15

For this reason Christ is the mediator of a new covenant, that those who are called may receive the promised eternal inheritance—now that he has died as a ransom to set them free from the sins committed under the first covenant.

Hebrews 9:14-16 (in Context) Hebrews 9 (Whole Chapter)