Because the cops really need to know our dietary preferences.
"You look different from this picture on your license, citizen! I'm giving you to the count of 3 to answer... what is your favorite menu item at Taco Bell?
It's bad enough big corporations want to gather intelligence on everyone so they can make retarded assumptions about what they will be able to sell you. Who wants government to do that?
They know when you go to bed, how long you sleep, when you wake up, what path you take to work, every place you ever drive your car, your phone pings your location every 15 minutes, etc., etc, etc.
Sounds meaningless, really? Suppose they decide the church you meet with is some kind of rebellious group that won't take the mark of the beast and won't worship the antichrist? It will be a snap for them to track and catch every single member of this rogue group.
Suppose these people you meet with in this underground group are spouting all kinds of rebellious teachings like "Jesus is Lord" and "there is no other salvation except through Jesus". They will need to shut that stuff down immediately.
Also, they want to know who has a gun? Who goes to a shooting range if they don't own a gun? Who goes hunting without a gun? If you never visit a shooting range or go hunting chances are good you don't have a gun. People who hunt are likely to have pictures on social media or talk about it. People who go to a shooting range will often have friends that do to, if they can get a handle on all your friends on social media they will get a very good idea of who you are.