what is interesting is thinking we are powerful enough to break the seal of God.
You are assuming God has not enabled the seal to last only for as long as faith resides in the believer.
Paul created a theological dilemma. A believer cannot know God without having the Holy Spirit.
So what happens to the unbeliever who leaves faith and departs from the body.
Does the Holy Spirit continue in a defiled soul, someone who truly is lost and not able to return to faith and the walk?
I am not sure the apostles ever resolved this, because it is the Lords work in mans heart not ours.
King Saul walked with God, spoke with the prophets but was also tormented by a spirit. I suspect this is all about how the Lord works His purposes through everything, and nothing is that clear. If we knew who all the Judas people were would we hunt them out and reject them, or the weeds, or the elect. Jesus is clear all will be in the body, but the Lord lets everything grow because to weed it out would damage the elect too much.
What we are told is to confront sin, and deal with as a body, and to keep ourselves pure and holy in the Lords sight.
I now see we are to exercise faith, our emotional conclusion, the Holiness and purity He has created in us through the washing of His word, the blood of the lamb and the Holy Spirit through repentance and confession of sins. Clearly also not all sins are confessed, which is implied by this
16 If anyone sees his brother commit a sin that does not lead to death, he should pray and God will give him life. I refer to those whose sin does not lead to death. There is a sin that leads to death. I am not saying that he should pray about that.
1 John 5:16
This verse suggests sin can be forgiven through prayer of a righteous saint for another brother in the Lord.
So easily we become legalists, point scoring, where love and grace works differently.
Our problem is these issues take time and spending time with the Lord to work through. Like all relationships hurt emotions heal and fade, things correct through intent and behaviour, rather than analysis and looking at the how and why in detail.
If things are defined by the Lord, then probably it is not definable for us, and best left alone. God bless you