Doesn't the concept of Eternal Sin undermine the teachings of Jesus and even his sacrifice?

When people get to the point of blaspheming the Holy Spirit, they have placed themselves in the same camp as Satan the devil. They have effectively made him their 'father' by rejecting Jesus as the Everlasting Father (Isaiah 9:6).

Those who have done that will never, ever, repent and seek God's forgiveness. That is why there are rare occasions in the Bible where it says to Christians not to pray for a certain person. "There is a sin that leads to death. I am not saying that he should pray about that." 1 John 5:16-17

This simply shows that there are some people who would rather be eternally in hell than submit to the authority of God and Christ and the Holy Spirit. They could be delivered from that fate if they repented before it was too late, but God knows when a person has 'crossed the line' so that the sacrifice of Christ will not avail for them. Not because the sacrifice is insufficient, but because the person has defiantly placed himself or herself as a rebel in Satan's camp. God will not force the application of Jesus' sacrifice on anybody determined to despise it.

No.

First of all, for those who do not recognize what the asker is referring to, he is referring to blasphemy of the HS, describe as an "eternal sin" (Mk 3:29). To understand "eternal sin", one needs to have a proper understanding of blasphemy of the HS.

As most people know, blasphemy of the Holy Spirit is the only unforgivable sin (Mt 12:31).

Here's what one has to do to blaspheme the HS. Admit that Jesus did supernatural miracles, but attribute that power to Satan rather than God (Mk 3:30). (Even atheists struggle blaspheming the HS because they won't concede Jesus did miracles or there is a God--or even that Satan exists for that matter.)

Simply flipping the bird at the HS and saying “F___ You!” can be forgiven. The Jews crucified the Son of God and were forgiven when they repented and were baptized (Ac 2:36-38). Harsh language against God is far less of a sin (Jn 19:11). But the situation is significantly different when one mischaracterizes the miracles Jesus performed through the power of the HS. Those miracles were designed to convince people that Jesus was the Son of God and through him be saved (Jn 20:30-31). If a person gives credit to Satan for those miracles, what’s God supposed to do to convince them Jesus is the Son of God, provide more miracles? There’s nothing God can do. Because of their reprehensible attitude toward God’s power, their situation is hopeless, thus the sin is “unforgivable” and "eternal".

You need to distinguish redemption--Christ's sacrifice making salvation possible--from salvation, which requires following God's directions toward sanctification. All of us have been redeemed, but only a minority is following God's directions. If a person is in mortal sin at the time of death, there is no possibility of repentance and sanctification afterwards, which leaves the fact of eternal sin.

(Assuming you meant Eternal Punishment -- Eternal Sin doesn t make sense)

"Eternal Punishment" requires infinite resources. So to punish a single individual for a sin for even a single person is a huge waste of time and energy. It essentially a very stupid and petty idea particularly for an omniscient being. Threatening people with eternal punishment is simply a marketing strategy used by unscrupulous liars to recruit new religious supplicants or to coerce simple people that believe or hope they have an eternal soul.

Do you mean "the unforgivable sin"? It's not even described what it is exactly, so that makes it even weirder. I'm going to have to find some scholarship on the historical context of that, because it makes no sense.

Here's one arguing it's a mistranslation:

https://books.google.com/books?id=OxEiAgAAQBAJ&pg=...

There is no sin the blood of Jesus can't wash away, but there is ONE SIN that Jesus will refuse to allow his blood to wash away, or rather it's you who refuses to allow the blood to wash away your sins, and that's the rejection of his blood all together. Aka, not accepting his blood when it's offered. AKA rejecting Jesus.

No such thing as eternal sin. There are eternal consequences to sin.

No, it does not.