Good on Christians for imposing limits on themselves, but lose the halo.  Most secularists (agnostics) live by as stringent a set of disciplines as the most devout Christian.  Those who are truly comfortable in their beliefs won't have an issue with secularist beliefs and lifestyles.  However, too many times I have been asked on a first meeting: 'Are you a Christian?'  That is usually a lead-in to a pitch for their own beliefs.