Unfortunately for this author, he is either a liar or too lazy fo check his facts. In a long interview, Bishop Finn specifically stated that he was not a member of Opus Dei but was a cooperator -
Those who wish to help Opus Dei without being members may become Cooperators. The cooperators of Opus Dei are men and women – Catholics and non-Catholics – who are not incorporated into the Opus Dei Prelature, but who collaborate with the faithful of the Prelature in the various educational, charitable and cultural activities.
http://www.opusdei.org.uk/art.php?p=10879
Bishop Finn made it clear that he does not wear a surplice or go in for any discipline type activities. To say he is a member is not right.
It's cilice (pronounced "sillus"). A surplice is the lace overgarment often worn by altar boys or choir members over a cassock, and inflicts no pain whatsoever (or so I've been told).
catholicfundamentalism.com puts forward the view that God has the ability to program in three dimensions, and that He programmed everything in less than a week. Fundies don't like it, because it teaches that The Church is supreme, and modern Catholics don't like it because it teaches that The Church is, well, The Church.