True, but the nature of causality can be investigated. It ain't necessarily axiomatic or intuitive.
My point is not that I know how existence came to be, or that science does, but that no one does. Asserting that a specific entity, by definition, requires no beginning is just an intellectual tantrum. It's equivalent to holding your breath until your parents give in to your demands.
No it isn't. It is a philosophical "answer" to a problem which by definition science cannot answer.