Glenn T. Stanton explains in his book, The Myth of the Dying Church (2019): “The apparent shrinking of Christianity is both true and false. True in that nominal and weak ‘Christian-in-name-only’ folks are identifying as Christians less and less. But there is no indication whatsoever that serious faith is shrinking any.”

Stanton adds, “So is Christianity shrinking? Not if you’re talking about the biblically faithful congregations that call their people to genuine Christian discipleship. Only … the mainline churches … are free falling as if they have a millstone tied to their necks.”
“So the real story is,” notes Stanton, “this is a sheep and goats being divided thing. A clarifying of faith, rather than shrinking of faith.”
In John Calvin’s Commentary on Isaiah 9:7, he provides an excellent reminder for Christians of all ages that we are truly on the winning side: “Though the kingdom of Christ is in such a condition that it appears as if we are about to perish at every moment, yet God not only protects and defends it, but also extends its boundaries far and wide, and then preserves and carries it forward in uninterrupted progression to eternity.”
Dr. Byron Johnson, Distinguished Professor of Social Sciences and Founding Director of the Institute for the Studies of Religion at Baylor University is one of the country’s leading researchers on the role of religion in public life. He gave this bit of advice: “the secular media will continue to push out the narrative that religion is dying … why not focus on the hundreds and thousands of peer-reviewed studies that show the power of faith to transform people’s lives for the better?”
The church as we know it, the institutional church is certainly dying as it is not the church Jesus established. In the last days before Jesus returns, we will return to House Churches as described in the Book of Acts. In fact, it is already happening. Francis Chan is leading the way in America. Can I also suggest you get a copy of Jim McCotter’s good book, Church Revolution Today to discover the truth about the church Jesus established and what God is doing through house churches that are following Jesus’ command to make disciples that make disciples.