God cannot be on a planet, or a star system or a universe. If a sentinent being exists in the physical world then that being is not ‘God’. Might that being be thought of as God? Yes, but that isn’t what we’re discussing. We are discussing a supernatural entity that does not operate in the natural world but created it. You are changing the definition of God. Stating a belief is NOT stating that something is a fact.
In your example we look to science. We know what conditions existed on Earth, we know that there are other planets with those conditions so a belief that other planets have sentiment beings because that is a logical conclusion. We have NOTHING to suggest that God exists, and we never can.