If I may, at times of extreme duress or melancholia,it may be possible to lose sight of the beneficence of God.This,better than anything else, underscores the importance of maintaining an earnest,consistent supplication for HIS discernment.
Such lapses are not to be looked upon as that which delineate reprobation,as we all have sinned and come short (as per Romans 3:23).I maintain that none living,dead or yet unborn has any gauge to determine that (Romans 8:33)and any who claim to have insights like these are committing apostasy...PERIOD.
Perhaps this person who has "renounced" the faith has come under circumstances that have no discernible connection to fairness;hence the spiritual capacity to properly put it into perspective has been temporarily arrested.....Quite honestly I was down that road myself several years ago.
In retrospect I was handed Divine favor;as the quality of life I now enjoy would have been impossible for me to obtain had Providence dealt me a more "favorable" portion then.

Submitted in the name of Him which hath redeemed the elect, Eric Wells,Protestant Laird of Glencairn