In the UK our local church is physically about 850 years old, But there was a church on the site back in 1086 and presumably before, as it was mentioned in the domesday book. It’s Anglican now, before then it was catholic, maybe it used to be a pagan worship site, maybe in future it will be for the cult of Cummings.
It has severe financial issues at the moment - maintaining the courtyard alone costs £1k a month. I’m waiting for more detailed finances on that.
Maintaining finances for any organisation is a basic bread and butter protection against corruption. I don’t see what harm there is in taxing religious organisations the same way as any other charity.
It absolutely has not survived millennia. What you call your Christian church today would be unrecognisable to the faithful of a century ago, never mind two, or five, or ten, or twenty. Or are you acknowledging that Christianity is the cult of Mithras, and that it’s still a death cult?