Well, following this, time travelers from our own dimension would never show up in our dimensions, which means that we’re relying on time travelers from other dimensions. I think we all know that those guys are just rude, and probably wouldn’t bother trying to warn us about anything.
BioNerd, have you ever held a Bible? There’s your experimental evidence. It definitely exists.
Now, if your were trying to be snarky about the contents of the Bible, I’d kindly remind you that the claims of the Bible are not scientific positions, they’re metaphysical. That means that science can’t actually tell us anything about them. Science can certainly point towards or away from them, but metaphysics is beyond the realm of science. That is why we primarily focus on philosophy. There are more kinds of knowledge than scientific knowledge ^^