What a wonderful, pithy formulation of the problem. If religion is the cause of all the worlds evils, and genocide remains part of the human condition after religion is eradicated, then genocide isnt evil. If atheists are right and all religion is a human artifact, then getting rid of religion will do nothing to solve the worlds problems. Man will merely replace his religious ideology with some sort of secular ideology, leaving mans irrational and superstitious tendencies in tact.
Religion is not "the" cause, but it is a cause of evils. I feel like now I must define what evil is, because I feel it has different meanings in how we use them. Evil to me is a class of bad things or thoughts people can do. I don't believe evil comes from the devil.
Genocide is evil, because of how bad it is. I would imagine you would question how I qualify bad as that is typically what most counter with. Killing off people in a genocide brings many negative things that far outweigh any possible positive. The loss of culture, bio diversity, future contributions, production ect are all losses. There is not a moral justification for those things with the argument that the people were disliked.
Man might replace religious beliefs with secular beliefs, but that will likely lead to better outcomes. Its not 100% guaranteed to make life a utopia, but it does remove some roadblocks. When people have a scapegoat for behavior that normally would not be justified, they will sometimes take it. When you remove that path, it becomes much harder to justify negative actions
Day also has recently criticized the idea that scientists are more rational than the rest of us. Its not that science isnt a rational pursuit; its that scientists are the weakest part of the scientific enterprise. Merely participating in the scientific enterprise does nothing to make a person more rational and less susceptible to non-rational biases.
It does not guarantee that a person will become more rational, but it helps train a person on how to be more rational. Living a life of rational inquiry will likely help a person learn how to be rational. Just like how Christians believe going to church helps them get closer to god. Practice makes perfect.
Thus, to eliminate all religions and replace it with science will do nothing to make people less superstitious and more rational.
This seems to contradict your previous statement. Not sure what you mean here.
We will live in a culture that lacks the means that has historically been most common and effective in teaching moral values to the younger generation.
The vast majority of what you find to be moral would simply be quantified as being utility increasing. Most of the thinks like not killing, not raping ect mean that people are more likely to invest in their futures because they dont have to worry about those things. If everybody raped, murdered, and stole then people would be less willing to invest.
I will ask you this, name something you find to be a moral/immoral thing that has nothing to do with utility or drives people to increase/decrease utility.