Hmm, me thinks it's worth the effort to find out who we have out there.
We should look at the electoral maps and try to share it among us and find out...
No elected MPs are out atheists. Some of the Bloc members or new Quebec NDP MPs may be (although they might be better called secular catholics). I know the Parti Quebecois has a Critic for Secularism in the National Assembly (I covered that for Canadian Atheist here: http://canadianatheist.com/2011/01/20/in-french-its-pronounced-lacit/).