a religious organization whose congregations are united in their adherence to its beliefs and practices—de•nom•i•na•tion•al \-shnəl, -shə-nəl\ adjective—de•nom•i•na•tion•al•ly adverb
The church of Christ is pre-Catholic.
Denominationalism came out of Catholicism.
So, if the church of Christ is pre-Catholic, then it is also pre-Denominational.