we just did it to other people in other ways.
Truth to tell, I don't expect humanity to enjoy the continued progress of rational thought as much as it has benefited mankind so far. Science runs on oil, a resource that has about run its course as a viable energy source. If science wants to continue its progress it better get busy finding another way to keep the lights on, and fast. Otherwise we will be back to dunking stools and human barbeques before we know it. All the signs point to an ugly fight over natural resources in the not too distant future. I expect a pretty grim next couple of hundred years although I'm not known for my optimism.
I agree that religion will never go away. We seem to be able to turn anything into a religion although I don't necessarily think that's a bad thing. We should certainly shine a critical light on it as a social institution and as a personal proclivity.