If you are a Jehovah's Witness all your life, you will have no idea if your religion is really big or not. Only when someone sees your religion who has already sampled many other religions, it's actually only then when you can finally grasp how large your faith truly is.
And so, as a born-to witness, I'm not entirely sure whether my religion is big or not. Perhaps this might be something we may have some further theological discussions on.