There are other ways to attend gatherings of people now. You and I are attending one of them right this minute: a forum on the internet.
For my purposes, talking with people on HN is generally superior to most meatspace options.
I have a compromised immune system. No one is going to cough on me on HN.
I'm a woman. This is an overwhelmingly male space. No one here can physically assault me the way they could in meatspace.
I can talk to people all over the world who have taken an intense and serious interest in a variety of subjects, so I can get rich discussion on a variety of topics. This won't happen in most meatspace environments.
In meatspace, it ends up being a great deal more important for people to have a long list of thibgs in common. Smokers tend to congregate together because strict non smokers don't even like being around them. Sexual orientation ends up being a thornier issue, especially in a small community where you are trying to choose a future mate from a small dating pool.
Religion presumably spread because it worked well for that time, or at least was the least worst solution. We have other options now for connecting with people. Those options are incredibly important to how the world works currently and people have flocked to them.
It's how you can argue the point with me at all.