it's the old creationist theory of if something `BE` ! ,someone or something have to have created it.Things just happen or exist out of thin air,or space,or what have you.
BUT ! they as of yet have not answered the question of who or what created the creator.They as of yet cannot explain it's out of thin air manifestation.
What they can't explain is the bigger question: if the creator can exist without a creator then why can't we? If god doesn't need a creator to exist then why would man???