Do Christians accept that there are many differing levels of religiosity in society?

When it comes to religion, it's not a case of someone either being or not being religious; it's a case of how religious they are. It's their level of religiosity that is in question. Some people can be very religious whilst others can be only slightly religious. So when Christians blurt out stuff like, "80% of the populace are Christians," this doesn't mean squat, right? A more meaningful statistic would be, "80% of the populace admit to being Christian, but of that 80%, only 20% have a literal interpretation of Genesis and 30% don't believe Jesus performed any miracles," don't you think so? You see, it gives a more informative view of the level of religiosity in society…