quote from Lane Craig’s essay:
“Imagine that you’re hiking through the woods and come across a translucent ball lying on the forest floor. You’d naturally wonder how it came to be there. If one of your hiking partners said to you, “Don’t worry about it! There isn’t any explanation of its existence!”, you’d either think he was crazy or figure that he just wanted you to keep moving. No one would take seriously the suggestion that the ball existed there with literally no explanation.
Now suppose you increase the size of the ball in this story to the size of a car. That wouldn’t do anything to satisfy or remove the demand for an explanation.
Suppose it were the size of a house. Same problem.
Suppose it were the size of a continent or a planet. Same problem.
Suppose it were the size of the entire universe. Same problem.
Merely increasing the size of the ball does nothing to affect the need of an explanation.”
(from Lane Craig’s essay: ‘Five Arguements for God’