You may hear something like the following:
Something had caused the many MILLIONS and MILLIONS of FORMER Christians to become Atheists in the last 20 years. And of course, they joined the other MANY MILLIONS who had left your childish religion before 20 yeas ago.
First, this is said with no substantiation. Where is he getting his figures. Perhaps these figures are correct, but it sounds like something that has been pulled from the air.
Second, the fact that people do the wrong thing does not mean that it is stupid to do the right thing.
Third, and perhaps most importantly, God works with a remnant, a small group. God does not care about public opinion. Very seldom will you find God working with the majority. He does most of His important work in the lowest circumstance with the most humble of people who are in the minority being persecuted by the majority.
It may be that this statement is made to start a theological argument between Christians who believe that Christians can’t fall away and Christians who believe that Christians can fall away. Both beliefs are based on Scripture. Both beliefs require some assumptions that go beyond Scripture. Perhaps the fact that Christians argue about this is an indication of a missing focus:
“Now these are the gifts Christ gave to the church: the apostles, the prophets, the evangelists, and the pastors and teachers. Their responsibility is to equip God’s people to do his work and build up the church, the body of Christ. This will continue until we all come to such unity in our faith and knowledge of God’s Son that we will be mature in the Lord, measuring up to the full and complete standard of Christ.” Ephesians 4:11-13 NLT
And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:” Ephesians 4:11-13 KJV
“But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory,even as by the Spirit of the Lord.” 1 Corinthians 3:18 KJB