PSR (metaphysics) Principle of sufficient reason... is something man requires. It appears we have no concept of having something for NO causal reason.

"The explanation of one thing is another thing," Bertrand Russell (1872-1970) It follows that the explanation or cause of the universe's existence, if there is an explanation, would have to be something beyond the universe, something beyond spacetime altogether. According to traditional theism, there is indeed something beyond, and this cause or creator is God.

If you were to ask why God exists that to me is like asking why a plenum is full: asking just shows that you don't understand the concept, either of a plenum or of God.

Theists will claim that there is a bonus in their answer to the question of why anything at all exists. It also answers the question in its other sense or senses, when it is about the meaning of life and the purpose or purposes for which we exist. The meaning and the purpose are contained in God's reasons for creating a universe and the beings in it, reasons that are the subject of divine revelation. (john f post)

I Corinthians 2:1-16 God's wisdom is not man's wisdom.