Apparently whenever any discussion concerning science and evolution even ever so slightly bumps into religion, it is automatically a candidate for a move into the Religion forum, at the whim of whichever mods are on duty at the time. Of course, if a thread goes on long enough, all mods will get a shot at moving it into the Religion forum and no other mod will countermand that action.
So it would seem. Presumably, since most objections tend to be based on the objector's religious beliefs, all evolution threads are inevitably going to bump into religion somewhat. Some will be moved. Some won't. Who knows which will be which?