If you want to get technical, those words aren't even in the bible. The bible was written in Hebrew and Greek. Also, even after it's translated, I don't think it contains the disparaging term for a homosexual.
Most of the words in the filter are there to tone down some of the hostility on the forums. Like just about anything, there are appropriate and inappropriate uses of certain words. 90+% of the time, those words get used inappropriately and are thus filtered.