I think you missed the point of my first question.
2:136 Says: "We believe in God, and in that which has been bestowed from on high upon us, and that which has been bestowed upon Abraham and Ishmael and Isaac and Jacob and his descendants,
Why does this verse name Jacob and not name Kedar. Why is Jacob mentioned so many times and Kedar is not mentioned at all. I can understand Isaac being mentioned because they were both Abraham’s sons, but why so much focus on Isaac’s descendents and no mention of Ishmael’s? That’s what doesn’t make sense.
2.135 And they say: Be Jews or Christians, then ye will be rightly guided. Say (unto them, O Muhammad): Nay, but (we follow) the religion of Abraham, the upright, and he was not of the idolaters.
2.136 Say (O Muslims): We believe in Allah and that which is revealed unto us and that which was revealed unto Abraham, and Ishmael, and Isaac, and Jacob, and the tribes, and that which Moses and Jesus received, and that which the prophets received from their Lord. We make no distinction between any of them, and unto Him we have surrendered.
2.137 And if they believe in the like of that which ye believe, then are they rightly guided. But if they turn away, then are they in schism, and Allah will suffice thee (for defence) against them. He is the Hearer, the Knower.
Read the verse with context. You can clearly see, God teaching Muslims, how to reply JEWS and CHRISTIANS. There are two reasons for that. 1) Both Christians and Jews do accept all those people mentioned, except few like Jesus (pbuh) to Jews. 2) Most of them were came to Israelites with not much time difference.
Now, Kedar is not mentioned becasue 1) He was not a prophet.(God knows better, since all prophets are not mentioned by name in Quran) 2) He was not a saintly person accepted to Jews or Christians.
Descendents of Isaac (pbuh) is mentioned becasue they are accepted by you, like Yaqoob (Jacob), Yusuf (Joseph), Musa (Moses), Haroon (Aron), Yunus (Jonah), Ayyub (Job), Daood (David), Sulaiman (Solomon), Zakariya (Zacharia), Yahya (John the baptist) and Isa (Jesus) (PBUTA). The situation was focused on Jews and Christians, so the verse revealed accordingly. Otherwise as I have already said, lineage of Mohamed (pbuh) is not mentioned in the Quran by name.
I will give you the lineage of Mohamed (pbuh), but please note that we don’t believe in him becasue of the lineage. His own testimony is not taken as evident until Quran proves it’s own truth that it is from God and Mohamed (pbuh) is the messenger of God. There is no circular reasoning. Quran provides enough evidence for testimony to prove it is from God. The scintifically established facts are the best that can be examined today. Check
this.