Perfect God

Hello Rabbi,
In your first published book you describe all sorts of proofs for the existence of God. Anselm’s first proof, which is supposed to prove the perfection of God, is also rejected. So why bother with paradoxes concerning the perfection of God?
For example, if we have no proof that He is perfect, then there is no proof that He is omnipotent, and there is no contradiction between His omnipotence to create a stone and the fact that He cannot lift it because He is not omnipotent.
Or alternatively, there is no contradiction between knowledge and choice because there is no proof that he can even know everything.