Science is the disinterested search for the objective truth about the material world.

Very close cousins like humans and chimps have almost all their genes in common. Slightly less close cousins like humans and monkeys still have recognizably the same genes. You could carry on right on down to humans and bacteria, and you will find continuous compelling evidence for the hierarchical tree of cousinship.

No doubt soaring cathedrals, stirring music, moving stories and parables, help a bit. But by far the most important variable determining your religion is the accident of birth.

Mysteries do not lose their poetry when solved. Quite the contrary; the solution often turns out more beautiful than the puzzle and, in any case, when you have solved one mystery you uncover others, perhaps to inspire greater poetry

Granted, we may try to help our own family members because they share our DNA. Or help someone else in expectation that they will help us later. But when you look at what we admire as the most generous manifestations of altruism, they are not based on kin selection or reciprocity. An extreme example might be Oskar Schindler risking his life to save more than a thousand Jews from the gas chambers. That's the opposite of saving his genes.

It really comes down to parsimony, economy of explanation. It is possible that your car engine is driven by psychokinetic energy, but if it looks like a petrol engine, smells like a petrol engine and performs exactly as well as a petrol engine, the sensible working hypothesis is that it is a petrol engine.

I mean, in a way, I feel that one of the reasons for learning about Darwinian evolution is as an object lesson in how not to set up our values and social lives.