dirtfarmer here
If our salvation depends on being "born from above", born again, and it is by God's power that that happens. We, as humans, don't have the power to "born again" ourselves, but some say we do have the power to "unborn again" ourselves, which power God doesn't have, then the believer has power that God doesn't have. God has the power to save and the power to cast us into the lake of fire, but he doesn't have omnipotence. His power is limited in man's power, if man can lose his salvation
1 Peter 1:3 -7 We have are "begotten again to a living hope by the resurrection of Jesus Christ". That living hope is gone if we can lose our salvation
We are no longer kept by the power of God.
Our inheritance has become corruptible and fades away, even thought it was reserved in heaven for us.
Salvation from the presence of sin will not be revealed.
We have no reason to rejoice and we succumb to manifold temptations.
There is no more trials of our faith.
We don't have Joy unspeakable and there is no glory.
It is by God's decree that the soul that sinneth shall die, man has not power over this. God also has decreed that the blood maketth atonement for the soul. God has also decreed, "the life of all flesh is the blood", so, when Christ entered into the holiest in heaven and applied his blood to that altar, Jesus, the man, died eternally because he was the sacrifice on that altar. The Christ that we see in Luke was a body of flesh and bone, but not a body of flesh and blood. To me, it stands to reason, the blood of Christ is powerless if we can lose our salvation.
If a person can lose their Spiritual life, then the Spirit of God must depart and the spirit of man become, once again subject to the soul, rather than to the Spirit of God. The seal that was given to them at the time of salvation is removed and all the truths that the Spirit has revealed become a mystery again.
You give the argument for continuing in the faith with your quote of Peter, while making the argument against it.
If someone turns away from that hope, what hope of salvation do they have?
If someone turns from the faith, how do they receive the things of the faith?
Jude
3 Beloved, although I was very eager to write to you about our common salvation, I found it necessary to write appealing to you to contend for the faith that was once for all delivered to the saints.
4 For certain people have crept in unnoticed who long ago were designated for this condemnation, ungodly people, who pervert the grace of our God into sensuality and deny our only Master and Lord, Jesus Christ.
5 Now I want to remind you, although you once fully knew it, that Jesus, who saved a people out of the land of Egypt, afterward destroyed those who did not believe.
6 And the angels who did not stay within their own position of authority, but left their proper dwelling, he has kept in eternal chains under gloomy darkness until the judgment of the great day-
7 just as Sodom and Gomorrah and the surrounding cities, which likewise indulged in sexual immorality and pursued unnatural desire, serve as an example by undergoing a punishment of eternal fire.
8 Yet in like manner these people also, relying on their dreams, defile the flesh, reject authority, and blaspheme the glorious ones.
Do you believe it is impossible to turn from the faith once you have received it?