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The Koran
The Torah.
The Holy Bible.
Yes.
Judaism
Judaism is not a sacred text, it is a religion and that religion happens to have a sacred text. To learn more about Judaism's Sacred Text, read the Related Question.
Rig Veda is the most sacred Hindu text.However, it is not the only Hindu sacred text because there are the other three Vedas viz. Yajur Veda, Sama Veda and Atharva Veda, the epics Ramayana and Mahabharata, the Bhagavad Gita, etc.However, Rig Veda is not only the oldest Hindu sacred text but is the only Hindu sacred text that deals with Brahmajnana, the complete knowledge of the facts of life that don't change with time, place or person.
"Important" is a opinion
The Torah.
The Holy Bible is the sacred text for Christians.
the hindu sacred text is called a sakrit.
The Islamic sacred text is called the Qur'an