We can play with this one all day since we then run into a chicken/egg style argument.
If someone or something designed all we see then who designed the designer?

It's mans feeble attempts to grasp something beyond their knowledge that makes them believe someone or something must've been responsible .

Science is an ongoing thing and all we think we know is simply showing us how little we actualy understand and sometimes just how wrong we can be.

The man who thinks he has the greatest intelligence is the worlds biggest fool.