Interestingly, Copernicus, as great a point as I thought you were making, I'm no longer sure I agree with it. Would, for example, Christianity be undermined by your argument? The thing is, under the most faithful interpretation of Christianity, a Christian who dies is literally dead, with no soul surviving, and does not live again until after Judgment Day, when the faithful are literally, physically raised from the dead. Jesus, according to scripture, was literally, physically raised from the dead and ascended, bodily, into heaven. The popular view that, for instance, Grandma is looking down on us from on high, in spiritual essence, while her body rots in her grave, does not comport with the New Testament.
So if it were proven conclusively, and held as true by all Christians, that the mind was a byproduct of the brain, the more faithful, true, scriptural version of that religion's afterlife concept would survive. The only thing it would require is that God himself also be regarded as a physical being.
I could also imagine some tweaking would occur in other religions as well. The independent soul, the brainless mind concept may exist in a pop psychology sense among some religious adherents, and it may exist as a core, fundamental element in some actual religions. But the overall concept of religion would survive, especially among the 60% of the population who adhere to Christianity and Islam. Those two faiths could easily adapt.
So if it were proven conclusively, and held as true by all Christians, that the mind was a byproduct of the brain, the more faithful, true, scriptural version of that religion's afterlife concept would survive. The only thing it would require is that God himself also be regarded as a physical being.
I could also imagine some tweaking would occur in other religions as well. The independent soul, the brainless mind concept may exist in a pop psychology sense among some religious adherents, and it may exist as a core, fundamental element in some actual religions. But the overall concept of religion would survive, especially among the 60% of the population who adhere to Christianity and Islam. Those two faiths could easily adapt.