Hi EpilepticLearner,
The content/ideas that appear in RC and CR prompts (and even in IR prompts) tends to be drawn from real-world examples, data and logic. You do NOT need to be an 'expert' in any of the subjects discussed in those prompts to answer the specific question(s) that the GMAT gives you to answer - the given information in the prompt (along with some basic critical reasoning skills) will almost certainly be enough to get you to the correct answer.
That having been said, a prompt might describe an individual/group who believes in an idea that is debatable (or potentially incorrect). Thus, an inference question that's based on what that individual/group believes could involve ideas that are not scientifically correct. Those types of situations would be rare on Test Day though, so you likely have nothing to worry about on that issue.
GMAT assassins aren't born, they're made,
Rich