Because that truck said it had no slogan didn’t mean that it didn’t have one. And because you say your church is unaffiliated to something larger doesn’t make that true in the traditional sense. There is Catholicism, and then came Martin Luther - all that follow Luther’s disputations are Protestant, your denomination.
You assume I identify myself with Protestants, I do not nor am I Catholic.
I am a Bible believing, sprit filled born again Christian, who attends a church that is not bound by denomination classification.
You are free to accept that or not.
non denominationalism has no hierarchical chain of command the governing authority (in matters of operations and discipleship) ends with the pastor, or leadership team
So yes, that would make all of them Protestant - BUT - non denominational Protestant