How many have I verified? I’m not sure of the #, but I’ve verified much of classical physics, chemistry, astronomical observations, and lots of things in electronics (some of which rely on quantum mechanics) and electromagnetism.
But as I said, they question is not whether you or I have personally verified everything, but whether they are verifiable in principle, by anyone. The claims of chemistry, physics, astronomy, etc, are verifiable. The claims of a holy man are not.