michelaS but it is only by the power of current majority view that we determine that beating your child with a stick everyday is overall detrimental. some parents may yet believe that it is in the childs best interests to beat them.
I don't really think that ethics are subjective. I think it is scientifically/medically provable that physical and sexual abuse damages children in a manner that outweighs any potential benefits.
I think it has already been proven that feeding crap to children is damaging over their lifetime.
I think it will be proven in the future that indoctrination into faith when young is net damaging over a lifetime (because it seems obvious to me that telling a child they are only a good worthwhile person if they believe in a specific godlike entity is absolutely devastating when you realise that you just don't believe and there is not a thing you can do about it.)
And if you can prove that someone's parenting 'choices' are damaging their child then don't you have a moral obligation to intervene?
The afterlife question is much harder as it seems unlikely that the non-existence of the afterlife will ever be proven.
I personally find the evidence that you can make an atheist believe in god, have visions of god/angels etc. and know in their heart that god exists simply by applying a magnetic field/electric current to the correct part of the brain, and that they then return to lack of belief the moment you stop zapping them, fairly compelling evidence that faith in god is the product of brain chemistry and not the product of the existence of a god.
Such experimental data will undoubtedly increase with time until such point as the likelihood of the existence of god will be considered very low by society as a whole.