And when did the sacrifice of Christ stop paying for my sins? For "If we confess our sins, he is faithful and just to forgive us [our] sins, and to cleanse us from all unrighteousness." 1 John 1:9 (KJV)
So at least you believe that one needs to confess future sins after committing them to stay in God’s graces?
And when did the sacrifice of Christ stop paying for my sins? For "If we confess our sins, he is faithful and just to forgive us [our] sins, and to cleanse us from all unrighteousness." 1 John 1:9 (KJV)
Since ADSUM actually invoked asking for forgiveness as an argument against all the future sins of believers being forgiven,then it seems there is some disconnect here. You are correct in saying "no one can atone for sins that have already been atoned for by Christ, whether theirs or another’s" as far as making atonement that pays the price for forgiveness, and you are also correct in invoking 1 John 1:9.
The issue - besides eternal security - is whether salvation requires confessing all of our sins and atoning for them and attaining to perfection of character in this life or in Purgatory, or whether it is the penitential heart-purifying regenerating effectual living faith, (Acts 10:43-47; 17:7-9) being counted/imputed for righteousness (Rm. 4:5) that justifies, and thus does confess and seek to make amends for wrongs they are convicted of. Meaning the effect is not be confused with the cause.
And (by the grace of God) above and above I have shown at length that it is faith, and thus the exhortations to persevere in it, and the dire warnings of departing from it. Meanwhile if salvation depends upon the Catholic criteria, no one can be sure they are saved (since they may miss by an inch), nor can they attain to the required level.