How did the Earth come to exist?
Earth is the apparent outcome of the laws of physics.
It was created and exists according to the laws of physics.
How did the Laws of Physics come to exist?
Nobody knows. It doesn't seem likely anybody will ever know. We simply understand them to exist as the creator and ruler of the things we do know about.
Our understanding of the laws of the physics must exist inside the laws of physics.
The question we should be asking ourselves is, in what ways have cultures of the past expressed the same idea?