On island A, I don't expect to see any religion at all appearing spontaneously. With proper education, people have no need to invent an explanation to lightning - or to the apparition of human beings.
I would expect the society to be more peaceful than ours, since everybody would have a higher level of education and that can be linked to a lower crime rate. I would still, however, expect people to lie, cheat, steal a bit, kill each other for love, money or a disagreement over football, do drugs... Humans will always be humans
.
On island B, I suppose it very much depends on how much religion is given to the children. If the parents are fundies, the children are much more likely to turn fundie themselves.
I would still expect the average religious level of the children to be lower than their parents'. After all, atheism
is correlated with education level. How many creationists really know about evolution?
Therefore, if the experiment lasted for many generations, I would expect the society to eventually become similar to that of island A - with perhaps a few fundies taking their children out of the schools and starting a small religious community on an isolated part of the island
.
On island C? Depends on how isolated the children are from those with another religion. If they go to the same schools, eat together etc., I would expect little else than loud disagreements over the dinner table. Now, separate them, and you have the recipe for a holy war. After all, the Old Testament is all about killing those who worship "false deities".
I would also expect violence and crime level reminiscent of the middle ages. Modern science - and atheism - would take as much time to develop as in the real world: centuries.
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maths?
