Why is only the Quran reliable

Concerns the question of the historicity of the described or claimed events in the Quran. Muslims have generally disapproved of the historical criticism of the Quran. In the Muslim world, scholarly criticism of the Quran can be considered an apostasy and can be punished by death Scholarly criticism of the Quran, is thus, a beginning area of study.Scholars have identified several pre-existing sources for the Quran.The Quran assumes its readers' familiarity with the Christian Bible and there are many parallels between the Bible and the Quran. Aside from the Bible, the Quran includes legendary narratives about Alexander the Great, apocryphal gospels,and Jewish legends. Thus, the question of the historical reliability of the Quran is tied to the question of the historical reliability of the Bible.