As someone who is fond of history, religion and the sciences, I understand that bias exist. It is important to acknowledge our many biases, instead of acting as if they do not exist. As long as a person is a fully capable and fuctioning being, everyone has a bias regardless of whether they state things as accurately as possible. Some people are better at hiding their bias than others.
With that being said, my contributions are made with the intent to include relevant topic information and/or to keep others' biases in check. As Wikipedia puts it, biased sources, even with other aspects of the source making it invalid - should be balanced out with reliable sources.
