I really don't get what you mean here, can you elaborate more? what you mean by Lost Paradise here is John Milton's poem?
Milton writes the more traditional explanation of Paradise: the evil Satan, the evil snake, the disobedience of first Eve and then Adam... the punishment of being driven out of Paradise... the extra punishment for all women to be in pain when getting children...etc... BUT... everything is solved again when the Messiah comes.
Milton wrote BTW also Paradise Regained, but that is too much outdated theological, not worth the trouble of reading.
I used Lost Paradise and not Paradise Lost to distinguish without losing the connotation.
Milton in line with Old Testamentic Bible that is addicted to wrath, doom and punishment. Many prophets all the time busy with that.
So let's take the story much more at a simple "matter of fact level"
* There is Paradise
* Adam and Eve are innocent
* There are many fruits that supply ample food and no clothes etc needed: everything is provided
* There is a Tree Of Knowledge (incl Good and Evil)
* Eating fruit of that Tree is forbidden
* After eating that fruit Adam and Eve lose their innocense and are expelled, have to struggle for a living
* But Paradise will come back as a new lasting Paradise or come back as a Kingdom of Heaven when the Messiah comes.
That
innocense of your own youth is something you can remember... but at the same time it is lost forever because
you know too much... it is a
nostalgia to your early past as kid to something you can never reach again.
In Paradise everything was provided like your parents do. And the punishment is being expelled from being provided: you stand on your own and life is a struggle. Like becoming an adult starting your own life and household.
Having now
as adult that responsibility of your own household, family, kids you learn to see risks that threaten your struggle in being a good responsible parent. The older you get, the more risks you can see. Your "fear" for the future, for what can go wrong, is now part and parcel of your life.
How to take control of your future and improve, how to avoid doom ?
Ideology gives you a tool for that and Hope as well. Ideology more the rational systemic approach like theology (more for the elite, the intellectuals). Hope more simple, more the romantic or Faith approach (more for the people to busy with practical living).
Whereby I see not much difference in the Hope you get from a romantic Faith approach from a religion or the Flag of your Nation.
Both supply in that respect The Big Protector for the future.
Looking in this way at that classic story it becomes a story of our own life