Pot kettle black!
You aren't paying attention, are you? The universe may well have had a beginning but
no one knows the state of existence before then. Therefore
no one, including you, can possibly know what caused its formation. But it is reasonable to assume something natural since we have
never encountered anything other. QED
Do keep up. Repeating oneself gets tedious quickly.
Maybe a giant toe nail did it, maybe the flying spaghetti monster did it. You can call it what you want but you still don't know. No one does and no one can. That's why it's called unknown.
You are engaging in the
Fallacy of opposition . You are right because you say you are right, therefore anyone in opposition must be wrong by default.
This is a fallacy and is also
unreasonable.
You can believe whatever you want but without evidence that does not make your belief any more reasonable than anyone else's suggestion.