The MRC report assessed how Wikipedia categorizes news sources, finding that conservative outlets are labeled as "generally unreliable" or effectively blacklisted.
Sanger recently told Fox News that Wikipedia has abandoned its neutrality policy, which insists content is "represented fairly, proportionately, and, as far as possible, without editorial bias."
"Neutrality means you can't tell what position a person takes on the topic," he said. "Any of the controversial issues that the topic of the article raises, you can't tell what position they take on them. Almost no Wikipedia articles these days rise to that level."
Earlier last month, Sanger wrote a blog entry in which he detailed his personal journey from skepticism to Christianity.