Religion might force you to church where you meet most of the community regularly. It goes far beyond just the purpose of religion. You'll know about every life event of every member, learn about businesses in the community, might meet new friends or even a spouse. The only social institute that comes close is school but school is not forever.
To stay in touch with friends, you were forced to actually go to them.
To look up information, you were forced to go to a library.
To discover music, forced to go to a record shop.
To eat whilst not cooking, forced to go to a restaurant.
Top enjoy photography or whichever other hobby, forced to go to a hobby club.
So without religion and post-school, as you maximally use all technology and conveniences available, you're now not meeting anybody. Unless you purposefully organize it. The defaults changed.