True, Ubiquiti doesn't have home-level gear, but I use it in my home
The USG is a gateway that does routing so you would use that with the switches/APs, but you need a controller (a Windows/Linux PC or their cloud key). It may be a different model but I would look into their mesh gear now for the church scenario. Proctor has had a lot of trouble with their cloud key to be honest. Myself I've run both their Windows and Linux controller software at different points in time with no trouble; currently using the Linux versions on a VM which to be honest only needs to be running for initial setup and re-provisioning the access points with new settings..
For home level stuff I've always used the top models from Netgear, granted it's been a few years since I was in the game doing this for a living, it's what I put at my mom's house. Their combo wireless/modem is pretty solid I've used a few of them. I've been happy with everything but range, and this is to be expected IMHO (they will all boast a greater range than realistic if you ask me.) Keep in mind that range is significantly influenced by composition of walls and other obstructions. Also, to reiterate I've only used their top end equipment, like things with a code name like "Nighthawk" or whatever it was, I've never used the cheaper stuff which I imagine is subject to "you get what you pay for
" like anything else.