An interesting POV.
I agree only partially though. Why?
Well, in my view, I think the
whole is greater than the sum of its parts. So, indeed, the mind is something greater than the brain. We see this everywhere. Ant/bee colonies, cars, humans, human societies. In fact, everything that is made of more than 1 thing has this feature. I think this is a wonderful thing because it allows for amazing possibilities e.g. an ant colony can be viewed as another organism distinct from the individual ants that compose it. Who knows what such organizing paradigms can achieve. Super-organisms, super-super-organisms and so on.
However, another
fact that we can't disregard is that the mind/self/ego is tied inseparably to the brain. There's no evidence whatsoever that shows the mind can exist
independently of the brain. So, the notion of a soul, eternal and indestructible, if that's what you're getting at, is still beyond reach.
All the observations you've mentioned are true but they still can't prove, what is to me, the crucial point - that the soul survives death. If that can't be done the soul, immaterial or whatever, is still nothing better than a material soul.
The super-organism (the ant colony) is definitely something greater than the individual ant. Take out one, or two, a few hundred, and the colony still continues to exist. But kill all the ants, and the colony dies with them. There's a difference, agreed, between the individual ant and the colony. But, the difference is not enough for the ant colony to survive the death of all the ants it consists of.