Please take note of words such as 'if', or 'unless'...
Hebrews 10:26,27 "For if we go on sinning willfully after receiving the knowledge of the truth, then there no longer remains a sacrifice for sins, but a terrifying expectation of judgment and the fury of a fire which will consume the adversaries.”
John 15:1,2, “I am the true vine, and My Father is the vinedresser. Every branch IN Me that does not bear fruit, He takes away; and every branch that bears fruit, He prunes it so that it may bear more fruit."
John 15:6 "If anyone does not abide in Me, he is thrown away as a branch and dries up; and they gather them, and cast them into the fire and they are burned.”
1 John 1:6,7 "If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth; but if we walk in the Light as He Himself is in the Light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.”
2 Peter 2:20-22 "For if after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and overcome, the last state has become worse for them than the first. For it would have been better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed to them."
Romans 8:12,13 "So then, brethren (speaking to those who are saved), we are under obligation, not to the flesh, to live according to the flesh—for if you are living according to the flesh, you must die; but if by the Spirit you are putting to death the deeds of the body, you will live.” Notice the word 'putting' is an ongoing action- not 'have put' meaning past tense. This implies constant effort, action on our part after being saved.
1 Corinthians 15:1,2 "Now I would remind you, brothers, of the gospel I preached to you, which you received, in which also you stand, and by which you are saved, IF you hold fast the word which I preached to you—unless you believed in vain.” In vain means a waste of time because it did not result in salvation.
Colossians 1:21-23 "And although you were formerly alienated and hostile in mind, (that is before you became Christians) you were engaged in evil deeds, yet He has now reconciled you (that is you have become a Christian) in His fleshly body through death, in order to present you before Him holy and blameless beyond reproach—IF indeed you CONTINUE in the faith firmly established and STEADFAST, and NOT MOVED AWAY from the HOPE of the gospel which you have heard, which was proclaimed in all creation under heaven, and of which I, Paul, was made a minister.”
2 Peter 2:20,21 "For if, after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, (now these people are Christians) and they are again entangled in these things and they are overcome, that the last state has become worse for them than the first. For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed on to them”
1 Corinthians 9:24-27 "Do you not know that those who run in a race all run, but only one receives the prize? You run in such a way that you may win. Everyone who competes in the games exercises self-control in all things. They then do it to receive a perishable wreath, but we an imperishable. Therefore I run in such a way, as not without aim; I box in such a way, as not beating the air; but I discipline my body and I make it my slave, so that, after I have preached to others, I myself will not be disqualified.”
Galatians 5:19-21 "Now the deeds of the flesh are evident, which are: immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions, envying, drunkenness, carousing, and things like these, of which I forewarn you, (who, ‘you Christians’) just as I have forewarned you, that those who practice such things will not inherit the kingdom of God.”
1 Timothy 4:1 "But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons."
Galatians 5:4 "You have been severed from Christ, you who are seeking to be justified by law; you have fallen from grace.”
John 15:10 "IF you keep my commands, you will remain in my love, just as I have kept my Father's commands and remain in his love."