Charles Stanley says that even those who stop believing in Christ cannot be lost.
For example Stanley writes:
"The Bible clearly teaches that God's love for His people is of such magnitude that even
those who walk away from the faith have not the slightest chance of slipping from His hand." p. 74
"The unfaithful believer will not receive a special place in the kingdom of Christ like those who are fortunate enough to be allowed to reign with Him. But the unfaithful believer will not lose his salvation." p. 93
"The apostle's meaning is evident. Even if a believer for all practical purposes becomes an unbeliever, his salvation is not in jeopardy. Christ will remain faithful." p.93
"And last, believers who lose or abandon their faith will retain their salvation, for God remains faithful." p. 94.
On the contrary, Jesus warned believers that those who were workers of iniquity (lawlessness) would be rejected on judgement day:
"Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
And then will I profess unto them, I NEVER KNEW YOU: DEPART FROM ME, YE THAT WORK INIQUITY" Matt 7:21-23 (KJV)
Harold and Donna Kupp
Quotes taken from: "Eternal Security" by Charles Stanley
Oliver Nelson Press, A division of Thomas Nelson Publishers.