In the new testament the word church is not a building or organization.. In the new testament sense "wherever two or three meet together in my name", "there am I in their midst".. that is a/the church.. You know, a denomination.. Even if there is nobody that considers themselves clergy.. The Holy Spirit is the ONLY requirement ...
[.. They are several churches in communion with Rome, several Orthodox churches, and perhaps, a few pre-Chalcedon churches such as Ethiopian Armenian and Coptic. ..]
Clubs with bylaws are a secular invention.. pagans, nominal christians, and Judaizers need that.. Galatians is pretty clear about that.. Judaizers do not like Paul or his teachings viscerally.. The book of Galatians was written so that Judaizers didn't hijack that church.. pity that they eventually did.. same with Greeks and Romans..
See the relevant scripture I cited in 15,139. Baptism, confession, and Holy Communion are all requirements.