Where in the world did you get your 99% figure of people who have "never questioned (their religion), have never been exposed to any other culture or religion"??
Well, I reckon I could be a little high on that figure.

Where would you put it? Show me some figures on people raised as christians who are not, people raised as muslims who are not, people raised as jews who are not, ....people raised as zoroastrians who are not.
How can you presume to know how a mass public arrived at their beliefs, and what exactly it is that they believe?
Well, because it's shoved down our throats in the mass media, rants from jw's on our doorsteps, people at work and elsewhere who want you to "come to my church," when you tell them you don't go to church, people who say "but you seem like such a nice person" when you tell them you're a non-believer. Thank god

I don't live in a small town.
In fact, being a non-believer is almost as bad as being left-handed.