Consistent compliance with Wikipedia policy is more important than your personal beliefs. Inconsistent compliance is a good sign of activist editing.
For example, if you assert something, and are presented with countering evidence from a reliable source, do you consider changing your position like a reasonable editor, or do you ignore it to argue your position?
When you join a wiki community, be a constructive editor.
Wikipedia articles should focus on describing facts in a neutral fashion. When writing about facts, cite sources that verify the information being presented. Stick to a factual style even when writing about fiction or opinions. Providing references is particularly important for controversial opinions—instead of using weasel words like "some people believe…," you should cite sources to help readers know who believes what, and why.