The church is not a building (although it sometimes have one) it’s not an organization (in the institutional sense), it’s a congregation of God’s people.
Matthew 18:20
“For where two or three are gathered together in my name, there am I in the midst of them”
Ephesians 5:25-26
“Husbands, love your wives, even as Christ also loved the church, and gave himself up for it; that he might sanctify it, having cleansed it by the washing of water with the word”
We are the church! We are not organized as one entity but we sometimes congregate in small organized cells and sometimes they are even unorganized structurally.
The Vatican and other church organizations want us to believe otherwise, that’s their business model.
I believe that Christians from many different backgrounds and creeds are members of God’s church.
Don’t misunderstand me, I think it’s good that people organize in churches(buildings) to worship, pray etc.
Our definition the word of church is usually cultural and based on today’s premises.