How many churches are necessary?

It's more about the doctrine or traditions based on the book. Like a movie based on a true story. New churches spring up because of splits in the congregation. Sometimes the splits aren't even doctrinal or biblical differences. I've seen groups of people leave a church because the new paster didn't want to stand behind the podium.A new pastor brings a new way of doing things and a small group doesn't like it. They start a new church so they can do things their way.A "church" decides that women who wear shorts at home can't teach Sunday School. (The pastor (a man) doesn't believe women should wear slacks, jeans, or shorts.) Needless to say a group left and started their own church.There's also different politics between the denominations.I'd say it isn't so much about the book and what it says, it is more about the expression of one's belief that causes so many churches to spring up.When it comes to the business of the church, Christians don't always practice what they preach.

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Scripture is like Newton’s third law of motionfor every action there is an equal and opposite reaction.
In other words, for every biblical directive that exists, there is another scriptural mandate challenging it.
-- Carlene Cross in The Bible and Newton’s Third Law of Motion