It's like saying attend local evangelical church. The people you meet will be potential friends for some types of people. For other types, not so much.
Good point. Although maybe a good percentage of people can imagine finding a social group at one or the other, noting that not all churches are evangelical in either theology or culture. Meaningful shared group experiences are important.
Virtually all churches have some sort of theology that they preach, and if you think it's a bunch of BS, it's not going to go well for you there. You can keep your mouth shut about it, but eventually the fact that you're living a lie will get to you.
It's like saying attend local evangelical church. The people you meet will be potential friends for some types of people. For other types, not so much.