The Islamic Sacred Book is Quran. God revelation of Quran to prophet Muhammad through the Angel Gabriel (Jibril) was to call mankind to worship the one and only one God with no partners, no son, no father, no companion, and no resemblance. This was the call of all God missions to mankind since Adam. Quran is the Constitution of Muslims and Guide to them (besides prophet Muhammad sayings and doings) on ritual worship, morals of life, religion principles, God commands on what to do and what not to do, Teachings on what is allowed and what is forbidden, pillars of faith, corrections of the falsified other holy book texts and beliefs and other rules of life.
Refer to the related questions below for more information on why Quran was revealed, Islam morals, and the pillars of Islam and faith.
yes i think that the main sacred writing of Islam allow ploygamy
"Hieroglyphic" means sacred engraved writing.
no there are none
The Vedas, the Upanishads, and the Puranas are the main ones. http://www.sacred-texts.com/hin/
The sacred writing of Buddhism is Tipitaka, and is a very large book.
No. The sacred writing of Judaism is the Bible, also called the Tanakh. The Vedas are one of several Hindu Holy Books.
The Bible...
heirogliphics
The Torah
hieroglyphics
To the parents, maybe.
Qu'ran