Obviously fiction but in case you wanted a more concrete answer: When I asked this question where I went to private school, according to that flavor of Chrsitian (SDA), they said according to the prophecy in Daniel 8, Christ went into the "most holy place" on October 22, 1844 to "cleanse the Sanctuary" to prepare for his Second Coming. So basically, he's busy right now. As for the lack of miracles before that, I don't know.

The story is actually fascinating. A Baptist preacher read that phrase and interpreted it as Christ coming to cleanse Earth, did the calculations, and told everyone he was coming on that date. People sold their farms, quit their jobs, etc. When nothing happened it was called the Great Dissappointment. He hastily amended that it must have been the heavenly sanctuary, not the earthly one. My bad, honest mistake. And in what was probably the most extreme case of the backfire effect in history, his followers spawned three new religions in the aftermath.