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...some further reading of Imre Lakatos on the subject of demarcation: 

http://www.lse.ac.uk/collections/lakatos/scienceAndPseudoscienceTranscript.htm

I think the group's discussion might be well served by considering some of the solutions to demarcation proposed here. I have a hunch, given Lakatos's criticism, where expressivity might fall as a scientific paradigm...though that doesn't dismiss it's utility elsewhere.

And for a slightly different take, some might appreciate:

http://www.huffingtonpost.com/michael-zimmerman/religion-and-science-resp_b_583460.html