Immortality means “deathless” or “the power of an indestructible life”.
Since both humans and and angels can be “destroyed” according to scripture, then they are not immortal. In the Bible, everlasting death is the opposite of everlasting life.
First of all let’s read that passage in context....perhaps it is your misconceptions that need adjusting....?
Jude 3-7 begins by warning about those whom Jesus and the apostles spoke about....ungodly men who would take Christianity in the wrong direction and justifying beliefs and conduct that was contrary to the teachings of Jesus Christ.....it happened just as they said.
“3 Beloved ones, although I was making every effort to write you about the salvation we hold in common, I found it necessary to write you to urge you to put up a hard fight for the faith that was once for all time delivered to the holy ones. 4 My reason is that certain men have slipped in among you who were long ago appointed to this judgment by the Scriptures; they are ungodly men who turn the undeserved kindness of our God into an excuse for brazen conduct and who prove false to our only owner and Lord, Jesus Christ.”
Then he goes on to remind the Christians that the nation of Israel is a model for why it was necessary to hold to Christ’s teachings without deviation, because those he rescued from Egypt never made it into the Promised Land because of their disobedience....
“5 Although you are fully aware of all of this, I want to remind you that Jehovah, having saved a people out of the land of Egypt, afterward destroyed those not showing faith.”
Then he uses other models to demonstrate the importance of remaining blameless by obeying all that God has commanded....
“6 And the angels who did not keep their original position but forsook their own proper dwelling place, he has reserved with eternal bonds in dense darkness for the judgment of the great day. 7 In the same manner, Sodʹom and Go·morʹrah and the cities around them also gave themselves over to gross sexual immorality and pursued unnatural fleshly desires; they are placed before us as a warning example by undergoing the judicial punishment of everlasting fire.”
The “everlasting fire” is “Gehenna”, which is erroneously translated “Hell” in your preferred translation.
Gehenna is a symbolic destination for everything that God wants to permanently disappear from existence.....it is the metaphoric “lake of fire”.....the receptacle for wicked men and angels...and even death and hades are thrown in there, never to be seen again. (Revelation 20:13-15)
It is called the “second death” because it is a death or end of existence that holds no hope of resurrection or return...so yes, the results are eternal, but not in the way that Christendom teaches.
There is no conscious afterlife where the wicked are punished eternally. That would make God a fiend, not a God of love. It does not come close to his established system of justice, revealed in his laws to Israel. There were no jails or any torture attached to God’s judicial system. It is totally out of harmony with his character.
Jesus own words confirm this....
Matthew 10:28...
“28 And do not become fearful of those who kill the body but cannot kill the soul; rather, fear him who can destroy both soul and body in Ge·henʹna.”
The whole person is “destroyed” in “Gehenna”, not tortured. You have to be alive and conscious in order to suffer.
John 3:16...
“For God loved the world so much that he gave his only-begotten Son, so that everyone exercising faith in him might not be destroyed but have everlasting life.“
The opposite of everlasting life here, is “destruction”.
I honestly think you need to do your own research as you seem to take certain things for granted that are not supported scripturally. False ideas about death and resurrection entered early Christianity, which were adopted from pagan ideas....exactly what was foretold.
Adam was family head, (as per God’s arrangement. 1 Corinthians 11:3) educated by God in advance of his wife’s creation......and it was indeed his actions that sealed the fate of all of us. But because of the exercise of their free will, there were several scenarios that could have resulted....God waited to see what they would do and whatever they chose, he would have responded appropriately.
What were the possible scenarios?....
1) The woman could have simply followed through on God’s command that she heard from her husband and told the serpent to get lost......What might have resulted?
2) She could have consulted with her husband first, and then made a decision based on what he would have recommended, seeing as how he was more educated and knew more than she did.....What might have resulted?
3) Adam could have rejected her offer of the fruit and lost her because the sentence was absolute for direct disobedience to God’s command.....What might have resulted?
4) The woman selfishly takes the fruit because she was deceived, and then offers the fruit to Adam, which then forces him to divide his loyalties...he chooses to join his wife in disobedience.....this was the result.....so where did that leave us?
Remember too that the first rebel was an angel....who convinced other angels to join him in disobedience....so whatever God decided to do, would also have to involve them. How did their influence affect mankind? What is their final destination?