I'm quite please to find out that there are theists willing to question the idea that religiosity can actually be measured in any meaningful way. Benjamin Zeller's "Religiosity? What’s in God’s name is that?" makes a few of the same points I have previously commented on. It's also nice to come across a theist that accepts their own personal spin/interpretation is not the only possible or valid point of view on a given topic.
I previously wrote about this topic in:
Can Religiosity be Measured? (February 23, 2014)