When it comes to religion, it's easier to talk to strangers than to friends/family - there's no baggage, no past arguments, no agenda or something to prove.
Different from a taxi, they know you're just a regular person, like them, and this might be just a side job. It's a level playing field. Thus, people are more sociable with Uber/Lyft drivers.
People expect to talk to the driver. Yesterday, this guy complained to me that his last 2 Uber drivers didn't even talk to him, wondering if there was something wrong. It's pretty obvious when a passenger wants silence (busy on phone, short/curt answers, etc), but usually they expect some banter. In contrast, this is a lot more natural than approaching people at a park or street corner.
It's pretty easy to go from superficial conversations about the weather, or "What job do you have?" to talks about god, purpose of life, or religion.
You get to meet and talk to people from all different backgrounds and all walks of life. I've had deep conversations with a Muslim astrologist, college party-goers, many Catholics, an astrophysicist, a Trump supporter, a Trump hater, a Messianic Jew, etc.
There's a time limit to the conversation (when the ride ends), so people are more willing to discuss controversial issues or anything uncomfortable. When the ride ends, everything can be left behind. (Plus, from your perspective, if you mess up, it's over soon, and you can try again in 10 minutes with somebody else.)
There's a fast learning curve. You don't have to be an extrovert or talkative person. You can practice with 10 people per day on how to talk to random strangers about anything, from sports to weather to their hard day at work. You can try different "openings" or questions to see what works and feels natural for you.
You can't get this exposure from a church seminar or book on Evangelism. Because real people can't be put in a box. A Muslim who's into astrology? A palm reader who calls herself Christian? You get to talk to people outside of your circle of friends or workplace.
You can do this less than 30 minutes per month. or whatever. You already have a job. I get it. There's no minimum hours you have to drive, and you can drive whenever you want. There's no obligation. I do this maybe 2 hours a week, and usually on my way home from church. It pretty much pays for my gas bill.
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