Not so. While some mainstream Protestant churches are shrinking (the Episcopal Church, for example), nondenominational Protestant churches are the fastest-growing churches in the U.S. They're growing by leaps and bounds. (They're also experiencing huge growth in places like China.)
For some reason--because it's easier, maybe?--nondenominational churches are often left out of church statistics.
ALL of the mainline Protestant churches are shrinking. All of them around the world, with the possible exception of the Anglicans in Africa.
Do you have any non denominational church statistics to bear out your claim? And do you have any stats as to how many of these non denominational churches actually remain Christian to go along with these claims? There are many non denominationals here who are overtly non Christian - the Gospel of Christ is for Jews only; we can only pray to Jesus; there is no Trinity, only Jesus/Jehovah with a mechanical windup Holy Spirit sent on missions; modalism, Nestorianism; Gnosticism; Paulicianism; and all manners of reversion back to first millennium heresies. We have all kinds of New Age Gaia worship and spiritualism in the Episcopalian and ELCA and similarly inclined non denominational churches. And so on, and so on.
This is possibly the first Christian writing that we have - it was written by St. Luke (who wrote his Gospel and Acts, and accompanied St. Paul in many of his travels). This is Christianity, not the inventions of the children of the Reformation.
