Well Lord Krunk
We can't really say that Einstein CREATED E=mc^2. It was always there, he just made a connection. Personally, I find Chadwick to be a better precursor to the A-bomb. Special relativity is fun and all, but until the thirties we didn't understand the concept of neutrons, which really pave the way for nuclear science.
Sure, scientists discover things that get used for horrible wars. Just look at Nobel and dynamite. It's easy to bash chemicals for harmful effects like CFC's, but looking at the positive effects at the time they were great.
Even fossil fuels have been both a blessing and a curse. There is no way we could have gotten through the last century without using them, but we're gonna have to stop using them soon or else it's gonna get real bad.
Religion does still exist. Just like greek mythology still exists. And somehow Germany still exists, despite trying to conquer the world twice and being defeated twice. Even if it doesn't make any logical sense anymore, people will keep on believing in it, even if they are told it is false. Unless you are in Rwanda, then they just kill you and all your family, and those beliefs are removed.
We don't actually need catholics, to be more precise. Figurehead aside, the system of religion is fundamentally flawed and not even backed up by their number one bestselling book for the past 2000 years. (well, really closer to 500, but whatever...)
There are indeed many stupid things people believe, but what allows us to be called smart is the simple truth that if we find something that contradicts perceived truth, we can change. The only stupid people are ones that will not change even with the truth readily available.