dear Mr Steven Hawking.
you did mentioned confusion about the creation and existence of this universe and question the viability of GOD. but sadly you will never found the answer forever and you can't simply transform a non-life material to life material on its own. it need complicated soul to exist and that's why some can see ghost existence using their naked eye. that ghost is actually soul that possess body before the body render useless due to aging or disease infection. after that soul gone to somewhere i haven't understood yet, some said it recycled to form another human, and other said it goes to heaven or hell.
ghost and soul is exist and those seen it before will agree with me although i haven't see one in my lifetime. those people practice exorcism to chase out ghost will have a concrete answer to my believe, those body possessed by ghost can do bizzarre things like turning the head 360 degree without tearing or have the combined energy of few people.
living organism need soul to sustain like plants and animal. plants also have emotion itself.
take note here as GOD may not related to any religion. In here not to confuse other or make jealous statement about religion,and i put the name of the matter that create us,CREATOR, that exist billions years ago. christian may not the creator because jesus only 2008 years old and he is born in Israel, same as other religion like Buddha born in India and Islam born in middle east. those saint only the transqulizer to us and teach us to be good person.
If scientist can't find soul or ghost theory, you may try to interview those seen it or experience it before. i bet many out there experience it before, yet science hard to explain the existence of ghost, if ghost existence is confirmed, then Hawking's Theory of Everything will render void and science will be jeopardised.
Reminder to all that CREATOR is NOT religious matter and HE belonged to NO religion, and most probably He still exist because he still creating new species now on earth.