As I said, if I'm right and the spirit is its own entity that can exist outside the body, then the brain would show no activity because the spirit is gone from it.<quoted text>A little be hedging, some Pascal's Wager?
I disagree. I think science can tell us what happens after death exactly the same way it tells us lots of other things. By evidence.
The evidence: nothing happens to you after death. You die, end of story.
Now...your body has a big ole time for a short spell, that's for sure. Lots of biological activities with your dead tissue. But you, as a person, are gone. All that remains are the memories of others and the things you left behind.
And that's got to be good enough.
If there was some kind of post-death activity of consciousness science could, in theory, detect it. So far, not a peep.
Now that dose not mean it won't some day detect something. Nobody can predict that. But as it stands, nothing. No ghosts, no goblins, no spirits, no gods, no demons, no afterlife, no heaven, no hell, no Zenu, and no Colob.