I think you'll find witnesses have a vast bible knowledge compared to the general populous or anyone for that matter. It is a well-oiled lamp in our hands.
One opening point I use on the ministry is "Do you have a bible. have you ever read it?" and nearly everytime they say "yes they have a bible and no they haven't ever read it".
And also compared to most religions that put their doctrines ahead of the bible. So to be a trinitarian you need a degree in trinity but not the bible to be a trinitarian. Using john 1:1 from their translations usually does the trick for them.
Your average person these days wouldn't even know how to look a scripture up.
Actually if I said to some what religion are you and they say "I am church of England" and I ask them if they read the bible they usually say no. To them religion is just something they write on the odd form.
One of the main reasons I am a Jehovah's witness is that I like reading the whole bible without flinching at the contradictions. To be in a Christian Religion where Jehovah is my one God and father throughout the bible is marvelous.