You make some really good points here. But I would caution against saying someone has blasphemed the Holy Spirit. There is much debate about exactly what that means.
But your point about believers sinning, confessing their sin, and therefore future sins of the believer ARE atoned for, is not only awesome, but brings to light this matter that a born again believer may sin, but doesn't commit WILLING sin. The sinless perfectionists LOVE to try and make a distinction between willing sin and "unwilling" sin.
They cheapen God's Holy Righteous standard of perfection by saying they don't commit willing sin. That quick, lustful glance at a woman in a bikini, sinning by disobeying Governing authorities by going ONE mile over a speed limit, or not giving to the exact penny on your taxes, that anger you feel at a brother, etc... are ALL willing sins. GOD DOESN'T GRADE ON A CURVE!
And let's not forget the WILLING sins of omission! Who here has sold EVERYTHING they own and given it to the needy? Who has not welcomed the stranger or homeless to live in their house? Who here has left EVERY member of their family and gone to be a PERMANENT missionary in the jungles of Africa, South America, or Asia?
What say the sinless perfectionist to that?
How does a BELIEVER confess sin they didn't even KNOW they committed!?
What does God say about unknown sin?
5 Know then in your heart that as a man disciplines his son, so the LORD your God disciplines you.
6 Observe the commands of the LORD your God, walking in his ways and revering him.
Deut 8
13 "'If the whole Israelite community sins unintentionally and does what is forbidden in any of the LORD's commands, even though the community is unaware of the matter, they are guilty.
14 When they become aware of the sin they committed, the assembly must bring a young bull as a sin offering and present it before the Tent of Meeting.
Lev 4
27 "'If a member of the community
sins unintentionally and does what is forbidden in any of the LORD's commands, he is guilty.
28 When he is made
aware of the
sin he committed, he must bring as his offering for the
sin he committed a female goat without defect.
Lev 4
God is specific about sins committed unintentionally. There is guilt, but can only we resolved when
he is made aware of the sin. This is how the issue of rebellion against the Lord and faithfulness and
faith is held true. The Lord appears never to be superficial, ie losing salvation and regaining it, but
rather things are done in the open and plainly.
It is why when discussion about known sin is not repented of, this is rebellion. To just assume things
are ok as they are without repentance and acknowledging debt, sorrow and the need to walk
righteously this is a problem.
Sinners excuse their sin and say it is just who they are. If christians do the same, how are they any
different from the world, or will ever become like Jesus and walk with Him?
Does any believer truly desire to be captive to sin, and not want to know victory in their life?
And we are not talking superficial compromise or papering over sin, or pretending things are not
a problem. Until people start getting serious about who they are, the role of the heart and emotions,
how we love and know ourselves and one another, little can progress.