I don't have zero evidence aside from an old book. I've seen and felt things that give me evidence that it's true. The problem with me saying that to anyone who doesn't believe, is they'll just think I'm crazy. There's as much solid evidence for me to believe in Christianity as science can get to explain the world. I've seen examples in the real world that play out with the hypothesis that Christianity is true. It's already been discussed here, that everything in the scientific field is limited by our perceptions of the world and our perceptions of the results of scientific testing. Also Christianity explains things science cannot, IMHO.
That's just the delusion. I've seen unicorns on a mountain far far away, but nobody is going to believe that story. How does this sound to you? I've also experienced and seen things while meditating that I can't even properly describe.
Should I tell everyone that "god" has contacted me and that I'm going to be your next savior? Just because you feel or see something that you can't describe you can't say that it is "god" since you don't know.