>> Since there is only one God, we must all believe in the same God
Not so. Not even close.
Yes, there IS only one GOD, Yahweh, Creator of heaven and earth.
But there are countless little-g false gods worshipped by ignorant or disobedient men.
Don’t kid yourself that those who worship false gods are “really” worshipping Yahweh without knowing it! Eternal damnation awaits those who worship false gods.
John 1:18
No one has ever seen God; the only God, who is at the Father’s side, he has made him known.
1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world.