Is God the ruler of them all?

Each religion in the world has its own god or gods. And the followers of each religion believe that their supreme god is the ruler of all. So, followers of Judaism, Christianity and Islam believe that God is the ruler of the universe, followers of Zoroastrianism believe that Ahura Mazda is the ruler of the universe, and so on. Since there is no objective, provable evidence that one religion is more true than another, we can only say that each belief may be valid for the followers of that religion. Of course the conflicting beliefs in each supreme god can not be true for all people, so it is best for Christians, Jews and Muslims to believe that God is their ruler, and allow others to hold true to their beliefs.