That belief sounds to me to give you a very insecure place in faith, that we are moving in and out of salvation, if that is what you mean. I believe when you become a child of God, you are a child of God, until you are completely cut off the tree. As I understand it we are born again once. I don't believe you lose salvation falling for a temptation, like stealing something from work.
I'm not clear about what happens if a born again believer slides back into living in sin, like fornication. Is he saved while doing this? I doubt it. Good question though, maybe someone has a good answer.
There are two places in Scripture that make it clear that a saved believer (who once had spiritual life) can die spiritually as a result of their sin, and then come back to spiritual life again by confessing and forsaking their sin again to the Lord.
Scripture Reference #1. - Luke 15:24.
In the Parable of the Prodigal Son (Luke 15:11-32), we learn that the prodigal son squandered his inheritance on prostitutes and when the son came back home and sought forgiveness with him, his father said that his son was “
dead”, and he became “
alive AGAIN.” Seeing the prodigal son did not die physically in this story, it is in reference to his spiritual state with God. Ephesians 2:1 says, “
you... who were dead in trespasses and sins;”
In fact, the father said two times that his son was DEAD and he is ALIVE AGAIN. In addition, the father said he was also LOST, and is FOUND (Luke 15:24, Luke 15:32). Generally when we refer to the lost in the Bible, we are referring to those who are unsaved.
Anyways, here is the place in Scripture that refutes your false thinking that we cannot die spiritually on account of our sin, and then come back to salvation again.
Luke 15:24 KJB
“For this
my son was dead,
and is alive again;
he was lost, and
is found. And they began to be merry.”
Notice that it says the words, “alive AGAIN.”
How can a person be alive again in what you believe? It makes no sense in light of your belief. What does “alive AGAIN” mean to you?
Side Note:
Oh, and Jesus is called the everlasting father because when He gives faithful believers a new physical body one day in the New Earth, they will be resurrected after the DNA (or likeness) of their Savior. In other words, Jesus will be sort of be like our father physically (if we remain faithful to Him). For it will be by the power of His resurrection that will make it possible for us to rise again one day. So Jesus is the father in this story. For Jesus is the only mediator between God and man (See: 1 Timothy 2:5).
Scripture Reference #2. - James 5:19-20
Another Scripture where we learn about how a once saved believer can die spiritually on account of their sin, and then come back to spiritual life again is in James 5:19-20. Let's read the passage.
19 “Brethren, if any of you do err from the truth, and one convert him;
20 Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins.” (James 5:19-20) (KJB).
Okay, first, for clarification, this passage is referring to “the believer” because it references the “Brethren” and it says, “if any of
you do err...”
Second, what this passage is saying is that if you (the believer or brethren) err (i.e. stray away) from the truth (i.e. stray away from Jesus who is the truth, like in parable of the the prodigal son), and another believer helps to convert this prodigal believer back to the faith again by getting them to confess of their sins to Jesus and rededicate their life back to Christ, then we are to let that believer who helped to bring back the prodigal believer know that he who converts the sinner from the error of his way has helped to save a soul from spiritual death, and we are to let them know that they have helped to hide a multitude of their sins (which took place on the account of their prodigal life). So this is yet another passage in Scripture that teaches that a believer can be saved, and yet die spiritually because of sin, and then they can come back to saving faith in Christ again by confessing and forsaking their sin.
Proverbs 28:13 KJB says,
“He that covereth his sins shall not prosper: but whoso confesseth and forsaketh
them shall have mercy.”