deity
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.
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).
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.
Oil is sacred to both Jews and Orthodox christians. Both religions believe it was a liquid from god.
Jews believe that God made the Earth.
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.
The Shabbat is a subcategory of sacred, since God sanctified it (Genesis 2) as one of the the sacred things.
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
Note: God's contract with the Jews was called a covenant. Or you might be looking for the word 'testament', 'sacrament', or 'promise'.A treasured people (Exodus ch.19; Deuteronomy 26:16-19).The fear of the LORD is the beginning of wisdom Psalm 111.10Then he said, 'I am the God of your father, the God of Abraham, the God of Isaac and the God of Jacob.' At this, Moses hid his face, because he was afraid to look at God. Exodus 3:6Interpretation: it is philosophers ('blind men') who see, and understand that the contract is still with God.Then the eyes of the blind shall be opened Isaiah 35: 5Then the philosophers shall see what is already true.
They both believe in a god that made the earth
God (Genesis ch.1).