22 Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart, 23 since you have been born again, not of perishable seed but of imperishable, through the living and abiding word of God; 24 for “All flesh is like grass and all its glory like the flower of grass. The grass withers, and the flower falls, 25 but the word of the Lord remains forever.” And this word is the good news that was preached to you. 1 Peter 1:22–25, ESV
The Puritans had a term they used in their theological writings and discussions describing professing believers who fell away or were in some way not consistent in their walk. They called them “temporary believers.” This may be a little offensive to many these days, but there are untold numbers of Pastors, Deacons, Elders, Evangelists, or whatever in our churches in our time who would not even qualify for membership in a 17th Century Puritan Church. As I have stated many times, I grew up in Oklahoma as a Southern Baptist. I have seen literally hundreds (if not more) of “invitations.” In a large percentage of these invitations, people walked an aisle, prayed a sinner’s prayer, was Baptised, and made a full member of the church. All of this taking place in a just a period of days. I have also observed a staggeringly high percentage of those professing believers last only a short period of time before disappearing from church never to be seen again.