The true God is the Creator and worshiping other than the true God implies the claim that they are deities. The God must be a creator and the proof of his being a creator must be either by witnessing what he has created in the universe or by revelation from God Who is proven to be a Creator. So, if this claim has no proof to support it, neither from the creation of the witnessed universe nor from the words of the Creator, then such deities are definitely false deities.
The Ka‘bah was mentioned many times throughout history. People used to visit it every year even from the farthest parts of the Arabian Peninsula, which showed great reverence for its holiness. It was also mentioned in the prophecies of the Old Testament: "As they pass through the Valley of Bakkah, ...
If man wants to disobey Allah, then, he must not eat from His provision and must go out of His land and seek a secure place where Allah cannot see Him. And when the angel of death comes to take his soul, let him ask for a respite to repent ...