How did we know that the moment of the emergence of the universe was based on the law of causality?

How did we know that the moment of the emergence of the universe was based on the law of causality?

How did we know that the moment of the emergence of the universe was based on the law of causality? Or in other words: Does the law of causality apply to outside the universe?

We approve the causal law on the existence because it is a primary law.

since the universe exists then there is an influence that caused it to exist.

Recently, it has been scientifically proven that the universe was created by an operator who created it, known as operatoer formulation of quantum mechanics

It must be operated according to quantum mechanics.

Otherwise the universe would not have appeared. This means that the law of occurrence and causality applies to the universe itself at the moment it appeared