I rather like it as a general term. As mentioned above, anything's better than bloody Celtic. In a US ecclesiastical context, however, it would have to be 'presbyteriana'. And in a "bite your nadgers off" South American context, 'piranha'.
And, talking of EC, I heard her last month with the Ratcatchers and was knocked sideways by her voice. She has now ecipsed her mum (although you can hear Norma's intonation in every syllable); it's crept up and gone from just good to awesome.