The Flock of God

In CHRISTIANITY MAGAZINE, January 1989, there was an article under the above heading. Since the word "flock" above is in the singular, it sounds like God has only one flock, but apparently the writer does not believe this. Jesus Himself said: "...they shall become one flock with one Shepherd." John 10:16. But our brother flies in the face of what Jesus said and tells his readers that:

"Today, each local congregation is a flock of God's sheep."

Dear brother or sister, do you believe that baseless assertion? I suspect that many of you might accept it without question because you have heard such taught before. Does the Lord have a First Baptist flock, a Reformed Presbyterian flock, an Emanuel Evangelical flock, and such like? Is each local church a separate, independent, autonomous flock of sheep, each with its own name?