Believing in the word of Allah the Quran
Allah Almighty accomplished the religion of truth of peace and His choice by blessing the Ummah with the beloved of all Prophets and last Messengers of Allah, Muhammad (SAW), descending upon Him the true and the greatest book of all time, The Holy Quran to let us guide and knowing Islam and learning quran, as narrated: O’ people! No Prophet would be raised after me and no new Ummah (would be formed) after you.
Verily I have left amongst you that which will never lead you astray; the Book of Allah, which if you hold fast you shall never go astray
Read Quran it is the true word of Allah; Muhammad (SAW) is referring about it. Thus the Quran turns out to be an ultimate way of guidance descended upon all mankind till the Day of Judgment.
And also in Surah e Baqara, Allah Himself glorifies the Holy Quran
Al-Baqara [2:2] this is the book; in it is guidance sure, without doubt, to those who fear Allah.
After this it leaves no room for argument to the guided ones or doubt in hearts and souls of true believers that the book that was reviled on prophet Muhammad (SAW) the holy Quran is the source of guidance for whom who are searching for guidance of Allah and his blessings.
Those of us who believe in greatness of Quran and try to understand and follow the true teachings of God are definitely differentiated from the ones who don’t do so, as narrated in this verse:
Al-Baqara [2:78] and there are among them illiterates, who know not the book, but (see therein their own) desires, and they do nothing but conjecture.
What makes Muslims believe that the Quran
Muslims believe that Prophet Muhammad is not the author of the Quran. God is its Author. The following points bear the fact:
First of all, the Quran itself, at a number of places and in different ways, says that it is from God. One of the claims runs thus: “This is indeed a Quran most honourable, a Book well-guarded…a Revelation from the Lord of the Worlds.” (Quran 56:77-80)
(Here, one ought to know the features of the Quran to understand the claim better. For instance, if the Quran had consisted of a number of books, and each book was made up of a number of chapters, then each of the books had to claim that it was from God in order to render the WHOLE volume as coming from God. But, this is fortunately not so with the Quran. The Quran is just ONE Book made up of 114 chapters. So, if the Quran claims, in any of its chapters, that the Book is from God, then the WHOLE Quran is from God. Yet, the Quran does not make the divine claim only once, but several times in different phrases and in different chapters.)