Stories such as Lord of the Rings and Narnia always have some prophecy which usually involves some decendent of whoever becoming king and then everything being ok, yada yada yada. They never explain how it works ... because of course it cannot be explained - there is just some 'magic' that makes things work out.
Of course the bible is the ultimate story jam packed full of prophecies. So, for the people who believe it, what are the implications?
Well, if they were to be true then something has to make them work and bring them about right? Unless believers are willing to believe that there is just some 'magic' that does it then the obvious answer is that someone makes it happen. God. Simple.
So ... when he makes some prophecy about there being wars and earthquakes and general bad-crap happening ... he must feel obliged to make it happen otherwise he then looks like a big chump who failed? So he does it. Thanks god.
"Ah, no", the religious will claim, "he just sees the future" (to which anyone with half a brain replies 'cobblers!'). Where does free-will then fit into this if people are pre-destined to follow a particular course? What if it looks like they are going to keep on the straight and narrow ... is he going to make sure they go off the rails to keep to his plan?
Of course, writers with some skill like C.S.Lewis and J.R.R.Tolkein know that is a pandoras box that shouldn't be opened or any attempt made to explain things - it is just a tool to tell a story so they leave it with 'the prophecy said ...' and along comes the hero of the piece to win the day. We get a good book to while away some hours and rent the movie from blockbuster when it comes out.
The clowns who wrote the bible though were less skilled and end up way over on the L.Ron.Hubbard side of the writers rating scale ... they actually try to make a belief system out of the crap!
Isn't that the implication of 'prophecy'?