There are various works of God which stand eternally.
When He gives a believer everlasting life in the spirit, even God Himself is unable to remove that life on His Soveriegnty. He is immutable.
Our Lord and Savior Christ Jesus sacrificed His spirit for us once and it was returned to the one found righteous for His faith.
We were all originally condemned, but upon that initial saving faith, were regenerated in the spirit.
The issue is eternal life. Once given, it may not be removed or else God Himself is unrighteous to the faith of the Son.
This doesn't mean a believer isn't able to sin after salvation. Post-salvation sin merely means we are not in fellowship with Him, not that the Holy Spirit ceases to indwell us. Falling away from God, after regenerated or reborn again, simply means we have turned to anything other than God after salvation.
After salvation, we have our first hope stisfied, i.e. we have eternal life. The next hope we are taught is to become doers of the Word. This we accomplish by renewing our minds daily with the mind of Christ. By returning to God, through faith in Him, we immediately confess our sins to Him through faith as royal priests. He is sure and just to forgive us those sins. We continue to abide in Him so that the enabling ministry of the Holy Spirit works in our thinking, by taking the LOGOS we read and making it supernaturally understood to our spirit, then making that spiritual knowledge known to our mind as GNOSIS, then again by the Holy SPirit, He makes that information in our mind known as an outward knowledge in our heart as EPIGNOSIS. When we apply that outward knowledge to situations we face in life we have an opportunity to become a doer of the Word, manifesting the power of the Spirit in our lives. All these things happen while we remain in fellowship with Him.
When we sin, or think about anything independent of Him, then we step out of fellowship and the Holy Spirit's ministry in our thinking is interruptted. We also scar our thinking or our souls, by thinking we can live in a counterfeit system of making order out of chaos independent of Him. Such is the worldly system which is parlayed into evil by the Adversary.
Nothing we can do will ever remove us from the love of God. Once we are in His family, we are His and none other.
You need some basic theology lessons.
Though I'm not a Southern Baptist, I can refer you to the Rev. Charles Stanley.
You are not forgiven of your sins, you are forgiven of your sins that you ask God to forgive you for. You must ask.
A murderer, though he were "saved" earlier, by declaration in a church or even in solitude, who dies unrepentant will not be close to God in the afterlife. Of this I am sure.