Would you date someone who was not religious?

Maybe. I suppose it would depend on how non religious they were. Someone simply not interested might be more compatible than someone religious but with non compatible beliefs.

I define myself as "ex Christian". It's not that I'm not religious, more that my beliefs have evolved to the point that I'm no longer comfortable with Christianity. So if I was single and looking, finding someone who identified as Christian who I was actually comfortable with seems a bit less likely than finding someone only vaguely religious.