This is the typical OSAS and Calvinistic means of reconciling the requirement that saving faith must have “things which accompany salvation” to be considered saving faith, while in contrast, many today hold to the specious doctrine that as long as one believes Jesus promise to give eternal life than he/she is saved.
However, the classic approach must construe warnings given to believers against rejecting their faith, and making Christ “of none effect,” and profiting them nothing, (Gal. 5:1-14) and becoming adversaries of God,(Heb. 10:27-31) to being only applicable to unbelievers, but which restriction the texts will not allow, as it was beleivers who were being specifically addressed.
There is also the additional reality that Paul also had assurance that some souls were part of the elect, based upon their tested faith, (1Thes. 1:4ff) yet there are souls even today who have manifested “works meet for repentance,” and a good degree of tested faith and virtue, only to latter die in adulterous relationships or the like.
Thus i find it more warranted that just as a soul makes a decision to believe, being enabled and persuaded by the grace of God, and which results in imputed righteousness, they also can choose to will-fully rebel or otherwise recant in times of testing, and forfeit that which faith procures, or at least they are warned against doing so, which clearly infers they could.
Yet we are also given assurance that by continued growth in grace, we may “make our calling and election sure: for if ye do these things, ye shall never fall.” (2Pet. 1:10) To God be the glory, though i certain do not feel close to having that condition.
Philippians 1:6 "I am sure of this, that He who started a good work (salvation) in you will carry it on to completion until the day of Christ Jesus." I accepted God's free gift of salvation and His promise to me is that He will keep me, not that I will keep myself. I choose to believe that God "cannot lie." If you've been born again, you will discover this truth in time. I spent ten years in the Pentecostal movement and left due to the false teaching of one being able to lose their salvation. The Holy Spirit and God's Word has made that abundantly clear to me, of which I have no doubt. I am not a Calvinist. I do believe those who choose to be born again, are predestined to conformty to the image of Christ and nothing can deter the completion of the salvation process.It is God who keeps us, not ourselves.
1 John 5:18 "We know that everyone who has been born of God does not sin, but the One (Jesus) who is born of God "keeps him," and the evil one does not touch him."
It's a wonderful thing to be secure in Christ and truly experience that blessed "peace that passes all understanding." Hope you find it someday by resting in the Word of God.