On annihilationism- from the link I provided earlier:
A person is a composite of four primary elements. At death, the earth (in the body) returns to and merges with the (external) earth-substance. The fire returns to and merges with the external fire-substance. The liquid returns to and merges with the external liquid-substance. The wind returns to and merges with the external wind-substance. The sense-faculties scatter into space. /.../ The words of those who speak of existence after death are false, empty chatter. With the break-up of the body, the wise and the foolish alike are annihilated, destroyed. They do not exist after death.'
Again, this does not amount to Annihilationsim, which is, as I've already said, the belief that the soul can be destroyed. What Ajita Kesakambalin says in the link you provided was that there
is no soul, not that the soul can be destroyed by God if certain conditions are not met. Annihiliationism is simply a belief within theism; it assumes the existence of the soul, that the soul is the true form of the self, and that there are alternatives to annihilation, such as heaven and hell. Ajita is saying that no such thing exists, no such realm exists. Just because both views allow for annihilation does not mean they are both Annihilationism.
False reduction of options. The "afterlife" isn't just about eternal damnation or everlasting life, nor is morality just about one set of moral principles or one set of moral goals.
Straw man. You brought up the point that religions offer explanations for the world that support their moral outlook. My response was that adherence to moral actions do not require eternal bliss or eternal hellfire. These are
examples of such explanations that support a moral outlook, not assertions that
all moral outlooks are said to require such explanations. Obviously different religions offer different goals and rewards and punishments. (Though, to be fair, eternal happiness does factor into most of them, just as eternal strife, disappointment, or pain factors into most)
In other words, my point was that there is no moral outlook that requires everlasting life to be a reward for behavior, so your assertion that the explanations of the world given by religion is based on morality rather than their lack of understanding is incorrect. And even if some people believed that there was no soul or afterlife, it certainly wasn't a widely-held belief. And it would have been hard to convince people of the truth of it without natural explanations for earthquakes, floods, droughts and other disasters, or an understanding of how consciousness is inexorably linked to the physical brain. A blow to the head can render you unconscious, but so could a blow to the chest or back, or enough alcohol. There wasn't any way of determining conclusively that the brain is responsible for the self, so even people who believe that there was no afterlife weren't likely to list that as their reasoning.
Arguably, consistently acting on particular moral principles does require a belief in karma and rebirth.
I'd love to see some sort of evidence to support this claim.
There may be forms of morality that don't require such a belief; and there are forms of morality that do.
Such as?
Materialistic goals typically don't require a belief in karma and rebirth; in fact, belief in karma and rebirth may be counterproductive to materialistic goals.
Any goals that transcend materialism, require such a belief.
You're confusing rewards with morals now. Obviously a belief in some sort of spiritual realm or cosmic justice is required to keep supernatural goals. If you want to get to heaven, you obviously need to believe some kind of heaven exists. If you want to experience life as a man and a crab, you have to believe in some sort of reincarnation. But that says nothing of morality. It doesn't address it at all, in fact, and there is no kind of morality I'm aware of that is inherent to such a belief system.
That depends on what particular moral principle one considers.
Justice, for example, does require belief in substantial selfhood.
How would you define "substantial selfhood?" If you're talking about belief in a soul, or that the self is somehow independent of the mind, then no, obviously not. One could accept that the self is effectively an illusion created by consciousness and still believe in justice because order and structure are vital aspects of society, for example.
Most people generally seem to believe that the body and the mind are the self. They might not specifically pin down the self to the brain, or as a product of the brain, but they do see the body and the mind as the self. They don't seem to think that the self would exist independently of the body and the mind; ie. they do not propose that there exists a soul.
I don't know where you get that idea, since Abrahamic monotheism requires
precisely such a belief. If you're a believing Jew, Christian, or Muslim, you believe in the existence of the soul. And certainly many of the eastern faiths require
some kind of "self" that exists independently of the brain, or else there would be no mechanism for reincarnation.
There's no doubt that people will think of themselves as body and mind, but if they're religious, they also believe themselves to be spirits or souls. Perhaps it's even a bit of a duality, but they do hold that belief.
Which is why I think that
Balerion said:
Because the idea of the self was not necessarily linked to the brain prior to the advent of modern science. The mind--and therefore the self--being a product of, and impossible without, the brain is not something some illiterate tribe in Bronze Age Mesopotamia would have considered.
probably isn't the case.
Well, as I pointed out, you're operating from a false premise--ie, that most people don't believe in the presence of a soul.