That is not to deny the usefulness of denominations. They help and support each different kind of flower in the Lord's garden. He delights in differences, but Christian tulips complain that roses have thorns, and Christian roses (Anglicans ?) fault the irises for lack of smell.
But here in the city I recognize hundreds of brothers and sisters in the one body of the Messiah who may or may not attend a denominationally connected congregation on Sunday, but they are active and work with each other in hundreds of ways permeating the whole city. There is no such thing as church membership in the NT. Membership is exercising a gift of the Spirit in the one body of this city (little children have the most important kind of membership).
Things can go wrong in a particular location or group of congregations
like a cancer (Mollie has just been treated in the nick of time for
melanoma), and the NT gives instructions for dealing with these (avoid
them, correct them, etc.). If all else fails (Revelation
2 & 3) the Lord can step in, and might even remove the candle of
the church in a city (as he did in Asia Minor and North Africa).
But that is not the end. As soon as we get Christians gathering in
any way in a city, the church as a body is there (though in some places
the government tries to make it illegal as it was in Russia, and
China). Right now a million Christians of all stripes are working
in every part of Arabia, so there too there is a church in each city, though
no Christian gatherings or building are allowed in Saudi Arabia).
We should be grateful to the First Amendment of the American Constitution
that guarantees the freedom of religion that allows the profusion of flowers.
Don't knock the way he tends his garden.