God is sacred because of His nature.
Perhaps you meant to ask why the relationship with God is so sacred (important) to Jews. The answer is because of the importance of being close to Him (Deuteronomy 10:20) and because of our gratitude to Him.
deity
When the Jews ask Moses.....who sent you....God said tell them "I AM that I AM" The name of God was so sacred to them they were afraid to say it...Ex. 3:13-14
The holy city for the Jews is Jerusalem. That is where the Temple of God was located
A short answer would be the Law and the Prophets - the Word of God.
something
It means, simply, made by God. (Many Jews and a few Christians take the view that the name of God is so sacred that it should not be spelled out in full).
Oil is sacred to both Jews and Orthodox christians. Both religions believe it was a liquid from god.
Answer Ai can only speak for the Jews..the Temple was built by them and was where they served God. God's presence never departed from there. Answer B (Hint on Answer A)God is everywhere anytime. God is not bounded by site or certain place. God is closer to you than your blood veins. I understand that the temple is sacred to Jews but I don't understand how the site itself is sacred if the temple if completely destroyed thousands of year ago well before Christianity per the Bible God revelation to Jesus (PBUH) and well before Islam per Quran God revelation to prophet Muhammad (PBUH). Currently the site includes sacred worship houses for both Muslims and Christians.
If you're talking about the sacred name of God in the Bible, it's Yahweh. It was so sacred, they didn't even put vowels in his name.
Torah
No, Jews do not hold any animals as sacred. However, there is symbolic significance to some animals.
Jerusalem.