Desert Dancer, there is nothing surprising about this. Most people who defend their religion do so not because of having detailed knowledge about that religion, but merely because it forms part of their own familiar cultural background and so naturally, they defend it.

For the same reason, they defend the non-religious social customs and habits they are familiar with, and they defend the nation they grew up in, the style of clothing they wear, the type of food they eat, and all the common stuff they take for granted. It's all part of their conscious identity.

There is nothing the least bit surprising that a great many religious people are not too knowledgable about their own religion, specially in mainstream religions. The same is true of a great many people, for instance, being very loyal to their country, but having only the most fragmentary knowledge of its history.

This is not a situation peculiar to religion. It is common to just about every major cultural factor.

I don't think the people doing the survey have chosen to focus on that, because they preferred to make some kind of point about religion. That suited their agenda for some reason.

It will also suit the agenda of most of the people who will choose to post on this thread, I suspect....so having said what I felt I needed to about it, I shall now leave you all to it and go play guitar instead. ;-)