I would be inclined to say that my "votes" would be for Science and Socialism. I don't see why you lump socialism and religion together since socialism (particularly communist) is usually anit-religion.

Still, in reality, I think you have to take a bit from all four. The real question is the balance. Even though I know you (Guv) are in favour of capitalism, I bet you wouldn't be in favour of totally un-restrained capitalism? i.e. There needs to be some sort of regulation to prevent monopolies emerging etc.

I am (generally speaking) in favour of socialism but not in a traditional sense. As you (Guv) mentioned, there are problems with socialism such as incentive.

Why do you think slavery no longer exists in the more advanced nations? I believe it is due to capitalism.
You may be partially right but need I remind you that of the western democracies, not many people would argue that the most capitalist nation would be the USA. They were also one of the last to abolish slavery.

The example of the USSR could be used as argument for socialism being in favor of government sponsored criminal activity, but some would say they were communists, not socialists.
Is this not a contradiction? Surely a definition of a crime is an action against the state. If a state sanctions or "sponsors" an action then surely it is not actually a crime?
Besides, although countries like the USSR and China are, so called, communist nations, if you actually look at communist priniciples, their systems have very little to do with communism.

As for religion and science, I think they are tools to achieve different ends. Many people don't understand this and try to disprove one with the other. I think someone once said something along the lines of : 'Science is about how things happen, Religion is about why things happen'.