I write all of this as a biblical Christian. One whom desires and seeks foundational truth in scripture, that will help edify us all to persevere and give glory to God along the journey. There is a modern day notion that has been carried through the centuries. In which, as a born again christian you could still somehow lose your salvation, faith, or belief in God completely. This non-biblical concept is one direct reasoning for many believers struggling tremendously in their walk with the Lord today. And even with non-believers, not seeing the point of coming to Christ at all, in fear of eventually losing their salvation all together. However, God is very clear throughout scripture on how He keeps His children in the palm of His hand. Firm and secure, forever. Many people don't agree, or just don't like the doctrinal terms: Perseverance of the saints, Assurance of Faith, and even, Once Saved, Always Saved. So, I personally have chosen to use my own: Once Secured, Eternally Kept. As a way for myself to stand firm in perseverance.
"I give them (believers) eternal life, and they shall never perish; no one can snatch them out of my hand." - John 10:28 | Jesus, addressing the shepherd (Himself) and His flock (believers) having eternal life secured in Him.
"Neither height not depth, nor anything else in all creation, will be able to separate us (believers) from the love of God that is in Christ Jesus our Lord."
- Romans 8:39 | Apostle Paul, urges that we are more than conquerors in Jesus, our assurer and sustainer.
"They went out from us, because they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us."
- 1 John 2:19 | Apostle John, examines the non-believers going out from the faith because they were never truly saved in the first place. Along with the true believers who had remained and persevered in faith.
So, we can see through the clarity of scripture, the question is not, Could I lose my faith? Or, Could I backslide (sin) far enough to completely lose my salvation? But rather, the real humbling question is, Am I truly saved? Moreover, Am I securely kept in God's hand until He brings me home to glory? Because, if you are a born again christian there is no question about it. "He who begun a good work in you will carry it onto completion." - Philippians 1:6 | Believer, that's a promise.
Hold onto it in glorious times, and in the disastrous times that you have.
We are promised many troubles and struggles in this life.
Therefore, we will fall short often, and even backslide into worldly pleasures that are ingrained in our sinful nature. There is no question about that. However, the persevering believer must have a new heart that breaks towards that sin, and must always come back, humbly seeking God in genuine repentance and reconciliation towards a pure communion with Him. In Christ we can do all things. He is the one keeping, sanctifying, and sustaining us along the way as we walk out our salvation, and as we fight the good fight of the faith.
"The saints shall persevere in holiness because God perseveres in grace. He perseveres to bless, and there believers persevere in being blessed. He continues to keep His people, and there they continue to keep His commandments." - C. H. Spurgeon
From the mountains of Montana, or to the ends of the earth.