Well, that's an interesting assumption... but aren't you speaking from silence?
George Barna's widely respected research looked at the 3 basic ways people come to accept Christ (in a way such that 5 years later, they are still "practicing Christians." (By no means a perfect measure, but it's about as close as anyone can come.)
First, a big event, such as a Billy Graham crusade, etc. Second, a chance encounter with a stranger, a brief conversation, then parting ways. Third, an ongoing relationship with someone in their life.
The first two resulted in an 85% failure rate. That is to say that 85% of the people who did appear to accept Christ... turned out to not have a real conversion at all. (That's not even counting hte people who ever even seemed to convert.)
In category 3, it is the exact opposite. 85% success rate.
Relationship is how God reaches people. Not just barking something at them or handing them a pamphlet. What really impacts people is reaching them through ongoing relationships. I mean people in your life -- family, friends, coworkers... even enemies. These are the people that you can reach. And if you lean on a tract instead of speaking to them... I really believe you're doing a disservice to them. As I said, you're speaking from silence in your post above. Besides which, Paul was hardly talking about unbelievers coming into the churches and synagogues to spontaneously listen to preaching, reading aloud from the Bible. That passage refers to people going out to the lost. We know that faith comes by hearing. This is the rule of thumb.
A piece of paper can't answer questions, show personal caring and understanding, have a relationship with the reader. Ours is a relational God! That is how He reaches people. Relationship.