I remember talking to a friend decades ago about church language and he said atheists walking in the church door didn't want to hear any churchy things because it didn't make sense to them. I told him that if I went to a baseball game for the first time that I would expect to learn the language of the game. I'd have to learn what a foul ball was if I wanted to understand the game and communicate to others about it.
That makes sense although at the same time it takes time to learn some of the more nuanced aspects of the game. Some of the rules and strategies are easy to pick up and others are a bit more obscure. A person watching a game for the first time might understand that the point of soccer is to kick the ball into the goal but won't understand the offside rule, or understand that the point of snooker is to drop the balls into the pockets but won't understand when a foul is called a miss, and so on.
I think there's also a difference based on the dynamic of the reason the visitor is in church in the first place. If I decide I want to go and watch a soccer game it's reasonable to assume that I want to enjoy the game and therefore that I want to understand what it's all about. If I'm only going because a friend won tickets and a hospitality package and didn't have anyone else to invite it's not reasonable to assume I particularly care about it - I might just be there for the free beer. Likewise if someone comes into a church as a visitor we can reasonably assume they want to know more about what the faith is about but someone visiting a church because their friend's child is being dedicated doesn't necessarily care about what the faith is all about.
I remember years ago I went to church at Christmas. At the time I wasn't a believer, I don't entirely remember why I'd even gone to church other than it was something to do with a friend. What I do remember was that the preacher spoke at such tedious length that I fell asleep in the pew, and I remember thinking that the preacher had many in the congregation who wouldn't normally be in church and so had an obvious opportunity to deliver a message that reached out to those people but chose not to.
