Thank you for contacting BibleAsk.
The Bible doesn’t teach that once we are saved we are always saved and that our responsibility ends when we become Christians. God’s Word is clear: “For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. But it is happened unto them according to the true proverb, The dog is turned to his own vomit again and the sow that was washed to her wallowing in the mire” (2 Peter 2:20-22). People can certainly chose to lose their salvation.
Therefore, the apostle Paul exhorts the believers saying, “Let us hold fast the profession of our faith without wavering (for he is faithful that promised) And let us consider one another to provoke unto love and to good works. … For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins” (Hebrews 10:23, 24, 26).
Christianity is not a one time decision. Jesus said that our salvation is based on the condition that we continue to abide in Him (John 15:4). And the apostle Paul said, “I die daily” (1 Corinthians 15:31). This means that he chose on a daily basis to deny himself and follow Jesus. The Lord Himself said, “If any man will come after me, let him deny himself, and take up his cross daily, and follow me” (Luke 9:23).
Ezekiel 18:24 confirms that: “But when the righteous turneth away from his righteousness, and committeth iniquity, and doeth according to all the abominations that the wicked man doeth, shall he live? All his righteousness that he hath done shall not be mentioned: in his trespass that he hath trespassed, and in his sin that he hath sinned, in them shall he die.” Paul also reminds us, “Wherefore let him that thinketh he standeth take heed lest he fall” (1 Corinthians 10:12).
To believe that once we’re saved we are always saved and that we cannot be lost is to believe that God takes away our greatest freedom – the freedom of choice. But if we choose to follow God, He will give us the power and grace to overcome “Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ” (Philippians 1:6). God promised the believer ultimate victory if he endures “He that shall endure unto the end, the same shall be saved” (Matthew 24:13).
For more on this topic check the following link: https://bibleask.org/can-a-believer-lose-their-salvation/
In His service,