Ha maybe. I always felt bad as a Jw that I just didn't care that people in the territory believed different things to JWs. You know how we were supposed to feel a burning desire to preach to the people and that we should love them and want them to be saved? That we should feel indignant over the damage done by 'false religion' and want to tell people the truth about God? Well I never felt any of those things because I had a 'live and let live' attitude, and was more interested in hearing about diverse beliefs than trying to correct them, and of course felt I was deficient as a Jw.
Using rabid zeal as an indicator of religiosity was probably a bad example, but I use it to highlight the idea that some people react like that regardless of their belief system. Richard Dawkins shows 'religious' zeal for his cause, spreading his message as a Christian preacher might. I'm not trying to run Dawkins down, but we must admit he has an almost religious fervour. Other Christians and atheists just live their lives and don't worry about spreading a message.
I separate religiousness from spirituality in this discussion. I see religiousness as being actions and practices, which JWs do for instance with all their meetings and that, as opposed to spirituality, a rich inner world and peace and desire to do good. In this way my atheist mother is the most spiritual person I've ever known. I believe spirituality comes from a sense of the divine, whether it's the awe of the atheist at the stupendous powers of nature or the Buddhist praying at her home shrine or the Christian communing with Jesus. In this way, many people are spiritual rather than religious, including the much maligned atheist.