Holy Quran.
Islam is a religion, not a text. The holy book of Islam is the Quran, which is considered the word of God as revealed to the Prophet Muhammad. So, in short, Islam is a religion with the Quran as its sacred text.
Quran is for Muslims. Quran guides them, together with Prophet Muhammad (PBUH) teachings, to the right path of God (Allah in Arabic).
Quran the holy book
You may check any of the Islamic sites.
The Holy Quran and Sahih Hadith
Quranic text is divided in chapters called surrah which contain verses . There are no paragraphs in Quran .
Judaism
Confucianism
The Quran is a very influential book in Iran, though it is preceded by the holy texts of the Zoroastrian religion. Also, though not a holy text, Shahnameh has deep roots in Iranian culture. Officially, it is Iran's national epic.
The Holy Bible is the sacred text for Christians.
The primary religious text for Christians is the Holy Bible.