Interesting website. They have a page about prayer too https://whywontgodhealamputees.com/superstition.htm

I agree with this and do not dispute it.

However, I think there is value to the human mind in performing ritual, meditation, and positive thinking. We can think ourselves into feeling better. The placebo effect works, even in you know about the placebo effect.

Jesus didn't know about these things 2000 years ago, but the stories about him make him seem like a worldly rabbi. He might have seen evidence of people getting better from disease through the power of prayer. (Never amputees, though.) The human body can fight disease; it can never regrow a limb.

The human mind also tends to remember positive experiences, and tends to ignore things that don't seem to work. This is how fake psychics and cold readers work. You send out a bunch of guesses, and get a couple of "hits", and the client remembers the hits. We all remember the hits. It's harder to remember the misses. (Side note: I experienced a palm reader at a party and experienced this first-hand, and despite knowing their techniques, I still felt it a little.)

All this makes me believe that our brains are generally susceptible to a construct like religion. And that there could be some value in meditation, ritual, and positive thinking. However religion is frequently a grift and makes people do bad things - it doesn't have to be, though. Being quietly spiritual is ok, which is what Jesus taught.