We've probably already had one.
Just because one claims a religious preference doesn't mean they are Believers.
I think the OP means someone who actively identifies as agnostic or atheist. There are probably tons of people who self-identify as Christian yet have not stepped inside a Church for religious services in months or years.
I fall into this category. I consider myself to be religious-somewhat-but I haven't been inside a church in years, and I don't like church services and ceremonies in general. You would have to drag me by force to one these days.
