while science makes them possible, it's not like scientific leaders call for them to be used on people for testing. Political leaders are the ones who have actually dropped the bomb, or called for/covertly sponsored experimentation on human subjects. Religious leaders always claim to be acting righteously, whereas science knows that with progress, comes responsibility and uncertainty. Plus science is willing to admit that it doesn't have all the answers, and requires a higher standard of proof for a theory to be generally accepted as fact. To me, this says that science is more honest, whereas religion is more sure of itself (the essence of faith is believing in things that can't be proven).