Actually “catholic” just means universal or ubiquitous, which when the name came into vogue, it was. It’s not something with doctrinal meaning as far as I know (as a non-Catholic).
**not something with doctrinal meaning as far as I know **
Oh, but his has a tremendous doctrinal meaning straight from the mouth of the Bible.
“Many (All) are called, but few are chosen.”
Christ came and died for us all. You, me, the people who hate Catholics.
Christ died for the Jews, the Mexicans, the Muslims, the Lutherans, the Presbyterians, the perverts — absolutely everyone.. Christ died for EVERYONE!
But not everyone accepts him. And so few will be chosen to enter heaven.
You are correct - it merely means that it is open to all in the context in the Bible. Being human, folks try to find other doctrinal connotations to back up their brand of Christianity being superior to all others. More carrying the Word, and less religious competition and we would all be better off.