

If someone says they are a part of one of the thousands of made up religions—then they are.
Jesus made the church to be community of people not a building to worship in.
I’d say most modern day Christians are very far from their own teachings that no one can possibly “do it wrong” any more than the churches own leadership.
This is simple.
The people who say Catholics aren’t Christian are wrong.
Glad to help and if you have any other questions feel free to ask.