I lived a life of terrible sin for years. When I turned to the Lord Jesus I confessed my sins in general but couldn’t remember all the sins I committed throughout my life. I now confess my sins in general occasionally ( I forget to pray many days) but don’t remember specific sins (like having lustfull thoughts). Am I still saved?
If you were ever saved, then you’re forever saved. When you asked the Lord to be your savior He agreed, (Matt. 7:7-8) and He sent His Spirit to live in you as a deposit guaranteeing your inheritance. (Ephes. 1:13-14) From that moment you became a new creation in His eyes, (2 Cor. 5:17) and the old you was forever dead to Him. Nothing can change that.
Now when you sin it can cause you to be estranged from God until you confess, but it doesn’t change your eternal position with Him because you can’t stop being His child. As soon as you confess, everything is made right between you again. This is possible because when Jesus went to the cross He paid the penalty for every sin of your life, even those you haven’t committed yet. (Col. 2:13-14) Forgiveness is automatic every time you ask (1 John 1:9)
It’s not necessary to remember and enumerate every sin. A simple “Forgive all my sins” is sufficient because sometimes you’re not even aware of sinning. David alluded to this in Psalm 19 when he said,
Who can discern his errors? Forgive my hidden faults. Keep your servant also from willful sins; may they not rule over me. Then will I be blameless, innocent of great transgressions
May the words of my mouth and the meditation of my heart be pleasing in your sight, O LORD, my Rock and my Redeemer. (Psalm 19:12-14)
This is a good passage to memorize and include in your prayers of confession.