Unfortunately, this analogy is comparable to many Christian churches. Many believers have gone to church for more than 40 years, and you would like to think that by talking to them, you would be able to get an idea what a Christian believes. But the reality is that they have not read the Bible, they do not spend any time with God outside of church, and they have only been semi-conscious for the majority of sermons that they have heard. They just show up, keep their heads down, shake hands, smile, and go home.
But that is not the only troubling comparison that can be made between these two scenarios. Let's assume that you never actually found out the back story on the factory worker that you interviewed. In reality, you would be totally clueless, but you would feel like you knew the basic ins and outs of the way his company works. That is exactly what happens to a lot of people who either grew up in church, or only know about Christianity from listening to a few Christians, watching a few Christian movies, hearing an evangelist etc. They are pretty convinced that they already know what we believe. That is a huge barrier that has to be knocked down in order for evangelism to go forth. And there are just as many Christians who are confused as non-Christians.
For that reason, one of the major task of apologetics is simply clearing away misconceptions. You do not have to be a professional philosopher or theologian to make a difference. You simply have to be an informed believer. You would be amazed how many people, even other Christians, who are totally in the dark about what the Bible says about a huge number of things. And that is the reason that we don't need everyone to be a celebrity apologist, pastor, or worship leader. They are typically all hanging out with other people who read the same books, watch the same videos, listen to the same podcasts etc. We don't need to bump more people into upper management. We need more informed people on the assembly line, starting conversations with that guy who is otherwise just punching the clock--people to tell him what the company is really all about. And just as a final tidbit, people tend to run away from conversations that start with, "Are you saved?" or "Do you know Jesus?" But they generally like to engage in conversations that begin with, "Did you know..." or "A lot of people misunderstand that..."