I would like to expand of your mentioning of different religions since I find it incredible how religious people tend to miss the overwhelming similarities between all major religions. The essence of all religions is that:

1. There is someone/something up there that has created the world and is taking care of us.
2. If we do good things and live our life in a good manner, we will have a good afterlife.

Who cares is the book called Bible or Quran, is the god called Allah or Buddha, is the symbol a cross or a half-moon... Those are all superficial details incomparably less important that the essence. Something like our skin color.

b) Stop them from doing anything that will endanger the raft and therefore your life; other than that, just watch them with interest till they all die?

An excellent explanation of how much people tend to overvalue the human race; of course, the gods of tomorrow are not here yet, but the cosmos is so huge that much more intelligent species than us almost certainly exists and probably know but don't care about us.

Cheers! : )