Yeah, Christianity doesn't make much sense - but what was it about that Quran that convinced you that it is the actual, infallible, immutable, revealed word of an actual god? Be as specific as you can please.
There is the archetype religion then the specific instance of it. The abstract concept is proven irrelevant of Mohammad (S). But if not Mohammad (s), there is no instance of it today.
So Quran reasons about Messengers and Prophets and Leaders God appoints and talks about it's abstract form. If not the Ahlulbayt of Mohammad (s), there would be a different Ahlulbayt that would be the door of God. If not Quran, then still, God can verify the truth through his words.
If we aren't required to love the chosen kin in 42:23, there would be a different chosen kin.
However, the reasoning that:
(1) God sends revelations/scriptures/writtings (Nubuwa)
(2) God unifies those scriptures with chosen leaders who understand it best (Imama)
(3) God manifests the truth through message of Messengers.(Resalah)
(4) God is capable of providing proof such as miracles of Moses (a) (Ayat)
(5) They come in groups known as "Ahlulbayt" (the wisdom of succession and unity of a chosen family in the cause of religion) (Wasiya)
is used to prove the proper religion in the Quran at least in abstract form.
Then if God would sent Messengers and God is proven to exist, then belief in God and Mohammad (S) become interlinked.
You study all the religions, and see which ones make sense to be from God. Rationally God is capable of providing proof, and if no miracles in the open now, there needs to be a different type of miracle and signs, which to me, only Quran qualifies in this day and age.
However, the truth is KWED, you don't believe in God and so don't see the rational of judgment day or Messengers in general.
But if you do, then, Islam is a very natural choice. Moreover if you believe in the light of God, you can recognize the light of God in this universe, although God is the light of it, is not God. It's his proof, and so it makes sense those who are his light will be delegated the task of guidance in human form as well, to avoid delegation problems.
That is the reason it's not Angels, is to avoid, delegation. Not everyone can handle seeing Angels and their reality without have judgment take them and less vision type then they will say they are hallucinating or bewitched, so to avoid people claiming to represent God's light, God's light is the one who takes on human form of a leader/guide. Mohammad (S) is said to be the proof and reminder for this reason.
His family are also that same light and reminder from God.
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