Western Civilization is dying. It follows that Christianity, which is an integral part of our Civilization is dying as well. A great period of unbelief is upon us and shall become deeper. See the end of Classical Civilization of which most of its people did not believe in their formal religion.
Keep a close eye on the southern part of the globe in which the Christian faith is growing bigtime. They are even sending missionaries to America and the west to bring the good news of the Gospel of Jesus.