Contrarini, to me in order to be truly “non-denominational” a “nondenomination” would have to be completely void of sectarian doctrine or practices.
You are correct about Protestantism having different beliefs in different denominations, and Episcopalians and Lutherans are very different from say Southern Baptists.
But as I have already stated so called “nondenominations” do teach speciffically sectarian doctrine, Baptist and Pentecostal doctrine. “Nondenominations” have specically sectarian practices such as baptising adult beleivers only by immersion only, as symbolic, not sacramental only. They participate in their “Lord’s Supper” rarely, and it is regarded as a memory picture only, not a sacrament of the Body and Blood of Jesus. Ever seen a “nondenomination” with a written liturgy, and that allows every member to actually participate in the prayers vocally, they don’t exist. True “nondenominations” would not have sectarian doctrines and practices.
Don’t you agree that Roman Catholics and Anglicans have much more in common, than Anglicans have in common with "nondenominations?
Frankly it disturbs me deeply to hear Evangelical Fundamentalists refer to their schools, bookstores, media outlets etc, as Christian only when they are not the only Christians. There are plenty of other Christians who were in existence for centuries before the “nondenominations” were thought of.