What is the rational proof that the Creator is Allah by this name, and that He is characterized by attributes of absolute perfection, and that He is the Creator of everything without the existence of other universes that have their own creators?

The majestic name "Allah" is the comprehensive term encompassing all attributes of perfection. Its meaning is "the One deserving of worship" due to His possession of perfect divine attributes, which necessitate the servant's love for Him, fear of Him, hope in Him, and turning to Him in repentance.

As for the proof that this Creator is "Allah," whom we believe in, it lies in the impossibility of there being more than one creator, and that this Creator must be characterized by attributes of perfection. This is the meaning of divinity, which cannot be attributed to anyone other than the Great Creator. Furthermore, rational proofs confirm the truth of the Qur'an and the veracity of the Prophet, peace be upon him, that Allah is the Creator of every created thing.