Faith healing – What evidence would I need?

A Christian friend of mine (No, not that one, another one) recently mentioned in his Facebook status that he’d witnessed miraculous healings at a Christian gathering. Ever the sceptic, I responded by posting a video of James Randi’s investigation of faith healing. In this video, Randi exposes US televangelists Peter Popoff and WV Grant.

He responded to me by asking:

“… Ever wondered what evidence you would need…”

Which is a very sensible and reasonable question. If I couldn’t say what evidence would convince me that I’m wrong about faith healing, I could be accused of holding my sceptical position irrationally, dogmatically, “No matter what”. Adam Lee covered this idea in respect to religious belief in general and the result is his Theist’s Guide to Converting Atheists essay which I’d recommend to everyone.

For me it’s not enough to be able to say, “This could have been a miracle” – not getting rained on when you forgot your umbrella could have been a miracle, but it could just as easily be chance. I’m trying to find something which could only have been a miracle. Recovering from a particularly nasty cold might have involved divine intervention, but this also happens naturally, so we can’t be sure a miracle occurred in that particular case. So I’m not interested in evidence of improbable healings, but impossible healings. Impossible that is, without miraculous supernatural intervention.

The evidence has to be reliable and evaluated in a way that does not allow bias, whether intentional or not, to creep in. To start with, the patients should be carefully assessed to ensure that they genuinely suffer from the claimed illness in the first place. Then we need to be able to judge easily whether or not they have been cured.

Ailments such as back pain, migraines or depression are probably not worth investigating as it is too hard to independently assess them – you can only rely on what the patient tells you.

Ideally we should also be reasonably confident of what caused the healing. If the patient visited mystical healers of all stripes then a few weeks later finds themselves cured, we still have some unanswered questions.

So to summarise, the miraculous healing would need to be something which:

  • Could only occur due to a miraculous healing.
  • Can easily be judged a success or failure by all around.
  • Can be linked to a specific faith healing claim.

A good example of this would be an amputated limb regrowing. If a group of Christians gathered around a multiple amputee and prayed for him to regrow his limbs and it they did indeed regrow then you’d have a very convincing case. I’d like to witness this myself, but also have other independent witnesses there to check I wasn’t hallucinating or missing some sleight of hand (or leg). This idea is examined in detail by the website Why Won’t God Heal Amputees, which says on the subject of healing amputees:

Notice that there is zero ambiguity in this situation. There is only one way for a limb to regenerate through prayer: God must exist and God must answer prayers.

That may seem very stringent and a very narrow way to define faith healing, but I think it’s warranted. It’s the only kind of faith healing we could really be sure about. Furthermore, I’m just an ordinary person and I could easily be fooled. I’ve seen enough stage magicians do tricks I couldn’t explain, heard (and believed) enough tall tales and been swayed by enough anecdotal evidence to know that I’m as gullible as the next guy.

So I think it’s reasonable – prudent even – to ask that these standards of evidence are met. Incidentally, these ideas are by no means exclusive, I’m sure there are other tests which could potentially provide excellent evidence of faith healing. I’m keen to hear other people’s suggestions. If we could agree on a reasonable experiment that could discern real faith healing from false faith healing, I’d be happy to try it out and post the results here.