The use of the Fish was to direct members to meetings (Head pointed towards the Meeting house for that particular night service). Often multiple fish would be left out in stalls (normally the fish pointed head up in the stalls) and sometimes they would be nailed to posts . The reason for using a Fish have been explained. The problem with the car emblem, everyone that knows what it really means keeps going to the right when they see one.

The Darwin Fish had nothing to do with the Creationist/Evolutionist Debates. It was created as a satire to the Christian version originally. I am sure there are those that use it to state their position. There is a third one. The Darwin Creature is eating a Fish. That one was also done in satire to the whole symbol thing. There is also a Christian version of the Fish eating the Evolving Fish.

http://www.sciwear.com/cat_auto.cfm

http://www.evolvefish.com/fish/emblems.html

http://www.planeticthus.com/jesus-fish.aspx?CategoryID=112&src=google&cid=1b

ratscloset
aka John