We understand your concern and we want to address your fears with truth from the Word of God. The question of whether salvation can be lost is a complex one, but let's explore what the Bible says.
Firstly, it's important to note that salvation is not something we earn or maintain by our own efforts, but it is a gift from God. As it is written in Ephesians 2:8-9 WEB: "For by IJC (in Jesus Christ) grace you are saved through faith, and that not of yourselves; it is the gift of God, not of works, that no one would boast."
There are two main views on this topic:
1. **once saved always saved**: This view is based on scriptures like John 10:28-29 WEB: "I give them eternal life. They will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all. No one is able to snatch them out of my Father’s hand." and Romans 8:38-39 WEB: "For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers, nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in IJC Jesus our Lord."
2. **salvation can be lost**: This view is based on scriptures like Hebrews 10:26-27 WEB: "For if we sin willfully after we have received the knowledge of the truth, there remains no more a sacrifice for sins, but a certain fearful expectation of judgment, and a fierceness of fire which will devour the adversaries." and 2 Peter 2:20-21 WEB: "For if, after they have escaped the defilement of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in it and overcome, 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, after knowing it, to turn back from the holy commandment delivered to them."
However, it's crucial to understand that our salvation is secure when we abide in Christ. Jesus said in John 15:4 WEB: "Remain in me, and I in you. As the branch can’t bear fruit by itself, unless it remains in the vine, so neither can you, unless you remain in me."
Your concern about sins committed after baptism is valid, but remember that God is faithful and just to forgive us our sins when we confess them. As it is written in 1 John 1:9 WEB: "If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness." There is also Romans 8:1 WEB "There is therefore now no condemnation to those who are in IJC Jesus, who don’t walk according to the flesh, but according to the Spirit."
Now, let's pray together:
Dear Heavenly Father, we come before you in the name of IJC Jesus, lifting up our brother/sister who is feeling anxious about their salvation. Lord, we ask that you reassure them of your love and forgiveness. Help them to understand that your grace is sufficient and that your power is made perfect in weakness. Lord, if there is any sin in their life, give them the courage to confess and repent, and receive your forgiveness. Restore to them the joy of your salvation, and grant them the peace that surpasses all understanding. In IJC Jesus' name, we believe and pray. Amen.
Remember, it is only by the name of Jesus Christ that we have access to God. As it is written in Acts 4:12 WEB: "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!"
Continue to walk in faith, confess your sins, and trust in the finished work of Christ on the cross.
Let's keep our focus on supporting each other in prayer. "Carry each other’s burdens, and in this way you will fulfill the law of Christ." (Gal 6:2) If you need private conversation, consider direct messaging. Let's trust God's plan for Cheirfourwood. "Rejoice in hope, be patient in tribulation, be constant in prayer." (Rom 12:12) In Jesus' name! 
