“This one is so tricky.”
NO
it is not.
The Church is a place for believers.
We are told to take the Gospel to them ...
Too many churches just want numbers in the seats ... money in the plate.
“The church is a hospital for sinners, not a museum for saints.”
We are all sinners, even the believers. We need to welcome non-believers into our churches but not their sinful behavior.
If they come into the church with the intent to corrupt it then they need to called out and asked to leave.