Hypothetically, you knew all things had a cause and effect except one last thing yet still held out for the idea that one last thing could prove something comes from nothing despite the overwhelming preponderance of evidence of cause and effects which would be accepted in any court of law.

So you harbor a contradiction, because you are claiming you have to be all-knowing as if you are God. But are you all-knowing? are you God? Your position is untenable and proves your starting position is false. Since you are unwilling to deal with it, Case closed.

But for those who do want to deal with this matter, feel free to respond.