"It's true!" he cried, in his ordinary voice this time. And all the people crowding beside him on the Temple roof shouted, "It's really true!"

That's the second-to-last line of the story. I ought to know because I wrote it myself. Now you know it too; that's the benefit of hindsight. Everything would be much easier to believe in if we had more of that. And having started at the end, I could now go on and tell you the whole story backwards. It's not unfeasible; it's been done before. But, aside from the fact that it would probably make you seasick, it would also take away the suspense and ruin the whole story. I suppose that's where hindsight falls down.