What you want to do vs What you should do. Life vs Death. Science vs Religion.

All of them are the classical conflicts of life. Those three simple things if explored and thought about enough can raise a hole knew controversy. A breach of ethics and morals for the greater good, commiting two wrongs to make a right.

But i wonder, in a world where everything has to be either "Good" or "Evil", which one would be considered Evil?

If i had to chose, i would call religion evil. I don't belive science and religion could ever blend together. It would be helping eachother to hurt eachother. They are both utterly and completely different things. And nothing can exist without its opposit, without its rival. You can't just take one of them away and they can't possibly be made to help eachother. Science and religion are indeed on the way to infinity, and even though they will eventually end up in the same place they will never connect.