There are some who believe that a Christian can fall away into sin and lose their salvation; while others believe that, once God saves someone and adopts them into His family, that individual will always be saved. I believe that this is a primary gospel issue and vitally important to one’s view of Christ and His gospel. However, I do not seek to argue or wrangle over words.
I believe firmly in God’s Word and its ability to teach, reprove, correct, and train God’s people to walk with Him (2 Timothy 3:16). For that reason, I present to you the following passages of Scripture and let God’s Word speak for itself.
If you would like to talk about this further, feel free to contact me. I cannot promise that we will come to a consensus, but I can promise that I will respond as lovingly and graciously as I can and would love to talk to anyone, especially about the gospel and the Word!
John 6:35-40 —
35 Jesus said to them, “I am the bread of life; whoever comes to me shall not hunger, and whoever believes in me shall never thirst. 36 But I said to you that you have seen me and yet do not believe. 37 All that the Father gives me will come to me, and whoever comes to me I will never cast out. 38 For I have come down from heaven, not to do my own will but the will of him who sent me. 39 And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day. 40 For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.”
John 10:25-30 —
25 Jesus answered them, “I told you, and you do not believe. The works that I do in my Father’s name bear witness about me, 26 but you do not believe because you are not among my sheep. 27 My sheep hear my voice, and I know them, and they follow me. 28 I give them eternal life, and they will never perish, and no one will snatch them out of my hand. 29 My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father’s hand. 30 I and the Father are one.”
Romans 8:31-39 —
31 What then shall we say to these things? If God is for us, who can be against us? 32 He who did not spare his own Son but gave him up for us all, how will he not also with him graciously give us all things? 33 Who shall bring any charge against God’s elect? It is God who justifies. 34 Who is to condemn? Christ Jesus is the one who died—more than that, who was raised—who is at the right hand of God, who indeed is interceding for us. 35 Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? 36 As it is written,
“For your sake we are being killed all the day long;
we are regarded as sheep to be slaughtered.”
37 No, in all these things we are more than conquerors through him who loved us. 38 For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, 39 nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord.
John 3:16-17 —
16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. 17 For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him.
John 3:36 —
Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him.
Romans 8:1 —
There is therefore now no condemnation for those who are in Christ Jesus.
Romans 8:28-30 —
28 And we know that for those who love God all things work together for good, for those who are called according to his purpose. 29 For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. 30 And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.
Ephesians 1:13-14 —
13 In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, 14 who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.
1 Peter 1:3-5 —
3 Blessed be the God and Father of our Lord Jesus Christ! According to his great mercy, he has caused us to be born again to a living hope through the resurrection of Jesus Christ from the dead, 4 to an inheritance that is imperishable, undefiled, and unfading, kept in heaven for you, 5 who by God’s power are being guarded through faith for a salvation ready to be revealed in the last time.
Philippians 1:6 —
And I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ.
 The Holy Bible: English Standard Version (Wheaton, IL: Crossway Bibles, 2016), Jn 6:35–40.