The New Testament gathering of Christians was called the ekklesia. It had no "denominational" label. It has been consistent since the time of Christ. The Nicolaitan attitude of the Catholic Church which corrupted the entire concept. The ekklesia of Christ still has no denominational label and never will.
>>>”It has been consistent since the time of Christ”
Who are these non-denominational Christians for two-thousand years? What is their history - your shared non-denominational history.