There have been many people who claim that they used to be Christians, but have left the faith. I posit the likelihood that most of those people were never truly saved - that they never tasted of the heavenly gift, and were made partakers of the Holy Ghost. I think most of them played church, or played holy person for a while, but then they gave it up when it didn't work. That is not salvation, and praise God for that.
Candy says that her position is unusual, but it is the most common that I have heard. I really haven't run across many people who feel that you are always saved, no matter what you do, even if you reject the faith. I hear "then they must have never really been saved" a lot, especially relating to people who have converted to Catholicism.
In Candy's normal, sensitive way, she says that people who have forsaken the sake must be idiots. She gives the impression that people who have lost their faith are shallow and only "played church." I'm not sure how people who were so convinced of their faith as to become ministers could only be playing at church, but that is her belief.
I can't help but feel sorrow for people who had a deep faith, but lost it because of a tragedy in their lives, or persecution, or temptation to despair. Consider those who lost their families in a natural disaster such as the tsunami a few years back. When your children are literally ripped from your hands, who could help but to have at least some doubts about God.
We also discussed in the comments section just a week or so ago, the Donatists who were dealing with Christians who had renounced the faith under the Roman persecution. While Candy would say that someone who renounced the faith rather than be martyred was likely never saved in the first place, the Donatists felt that these people had lost the grace of God. Truly, the problem of what it means when someone rejects the faith is one which has always been around.
Personally, while I hope and pray that in a time of sorrow or persecution I would cling to God instead of reject him, I feel nothing but sorrow for those who have not been able to keep the faith. I can't imagine how horrible it must be to have been a joyful member of a OSAS congregation, and then have all of your friends and former fellow Christians reject you and say that you must have only been playing at church instead of reaching out to you in your time of need.
As for the Catholic Church, we believe that salvation is an ongoing process. As Milehimama once put it:
We HAVE BEEN saved by grace:
Who hath saved us, and called us with an holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus before the world began
We ARE BEING saved
1 Cor 1:18, above.
Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;)- Ephesians 2:5
We WILL BE saved:
And ye shall be hated of all men for my name's sake: but he that endureth to the end shall be saved - Matt 10:22
We HOPE to be saved:
For we are saved by hope: but hope that is seen is not hope: for what a man seeth, why doth he yet hope for? - Romans 8:24
One could write pages on the many verses which speak of this teaching, but I will share only a few which lead me to disagree with Candy on this subject.
Hope is one of the three theological virtues, faith, hope, and charity. We hope to be saved.
Rom 5:2 By whom also we have access by faith into this grace wherein we stand, and rejoice in hope of the glory of God.
Rom 12:12 Rejoicing in hope; patient in tribulation; continuing instant in prayer
Gal 5:5 For we through the Spirit wait for the hope of righteousness by faith.
1 Thes 5:8 But let us, who are of the day, be sober, putting on the breastplate of faith and love; and for an helmet, the hope of salvation.
Furthermore, perseverance is important. If we are "once saved, always saved" then why would we need to persevere. Merely playing at faith is not truly having faith, so perseverance is not needed there, only true faith.
Heb 3:13-14 But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin. For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end
1 Tim 19-20 Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck of whom is Hymenaeus and Alexander; whom I have delivered unto Satan, that they may learn not to blaspheme.
Heb 10:36 For ye have need of endurance, that, after ye have done the will of God, ye might receive the promise.
1 Cor 4:4 For I know nothing by myself; yet am I not hereby justified: but he that judgeth me is the Lord.
And one of my favorite verses in the Bible, 2 Tim 4:7 I have fought the good fight, I have finished
the race, I have kept the faith.