You said I call my beliefs "reason". Which beliefs were you refering to?
As the universe having a cause is unfalsifiable, this cannot be true.
You cannot meaningfully make conclusions about what is beyond observation.
They're called laws because they are absolutely true for a system that is fully understood for the applicable law. They cannot be said to be true when they is no prospect of them being proved true. You cannot presuppose that everything has a cause, because everything has not been observed to have a cause. Instead of saying "The universe must have a cause." a scientist should ask "Does the universe have a cause, and if so, what is it?".