Although it's dubious that the Christian god exists, premonitions make me believe that there's some spiritual force at work on our planet.
I used to have a recurring dreams about a town in the mountains. I remember standing atop a large hill, looking down on a cobblestone street lined with old brick buildings. In the center of the street were tourists, two of which were wearing orange life preservers for some reason. I'd see my stepfather standing on top of a large rock overlooking a cliff, which was supported on the right side by two metal posts. I'd then appear in a pet store with a large artificial pond in the middle of the floor. I'd walk to the reptile room and look up to see a camera with a sign underneath saying, "SMILE!"
A few years ago I took a trip to Harper's Ferry, WV. I saw everything exactly as I'd dreamed, from the cobblestone street, to the white-water-rafters wearing life preservers, to the large rock, to the pet store with the smile sign under the camera.
So yeah, I believe that dreams can very well come true. I have no idea how this works, but I've seen too much evidence, first and second hand, to not believe.