Isn't that a corner stone of Theism? "If there isn't a god, what is there?" Once upon a time, when the world was a much smaller place, people needed answers and a reason. They reasoned, through ignorance, that there must be a higher being, in charge of it all.
As time has passed and so much of the mythology and superstitions have been debunked by science, many cling to religion because they cannot accept that this is all there is.