Lucifer was exiled from heaven due to certain choices he made with regard to his free will.
Once we are in heaven, we will have the free-will ability to make the same choice he once did.
Given infinite time and a nonzero probability of event X occurring, event X has a 100% chance of occurring.
Therefore, when we get to heaven, we will make the same choice that doomed Lucifer.
We will still have free will in heaven, but for a multitude of reasons will not sin, some of them being:
Unlike the angels/Lucifer (who also had and have free will) we will enter with full experience with sin. We will have already experienced satan’s powers, so know not to let him influence us.
Satan is not around anymore so only angels that made the free will choice to continue to humble accept God’s Love are there.
There is no tree of some extra knowledge there, since we now have all knowledge freely available.
We are no longer sexual beings (sexual beings compete for good reason), so we are prone to covet.
We will have spiritual eyes to not only feel the presence of the Holy Spirit, but literally see Him, with us always.
The big think is we have it all so there is no wanting, since our most generous Father has given us everything we truly unselfishly want.
Refutation #1:
While we will have free will, we will have no desire to do this or commit any other sin once we're in heaven.
Then why weren't we made that way to begin with? What is the point of our existence on earth?
If there is this Creator of the universe out there, His “creations” could not really “do” anything for Him, so this Creator would have to be seen as a Giver (Unselfish Lover) and not trying to “get” something from His creation.
So God would create the right universe for the sake of the individuals that will accept His gift (the most powerful force in all universes that compels even God to do all He does) and become like He is.
What keeps the all-powerful Creator from just giving whatever He wants to his creation?
There are just something even an all-powerful Creator cannot do (there are things impossible to do), the big inability for us is create humans with instinctive Godly type Love, since Godly type Love is not instinctive. Godly type love has to be the result of a free will decision by the being, to make it the person’s Love apart from God. In other words: If the Love was in a human from the human’s creation it would be a robotic type love and not a Godly type Love. Also if God “forces” this Love on a person (Kind a like a shotgun wedding) it would not be “loving” on God’s part and the love forced on the person would not be Godly type love. This Love has to be the result of a free will moral choice with real alternatives (for humans those alternatives include the perceived pleasures of sin for a season.)
This Love is way beyond anything humans could develop, obtain, learn, earn, pay back or even deserve, so it must be the result of a gift that is accepted or rejected (a free will choice).
An unselfish God would be doing all He can to help
willing individuals to make that free will decision to accept His Love. Again, since God will not be forcing these individuals, they have to be
willing (it is their choice) and God cannot “make” them
willing since that is robotic action. God can only at best make them free will agent (like God is) and capable of make the right decision.
This “Love” is much more than just an emotional feeling; it is God Himself (God is Love). If you see this Love you see God.
Let me just give you an example of How God works to help willing individuals.
All mature adults do stuff that hurts others (this is called sin) these transgressions weigh on them burden them to the point the individual seeks relief (at least early on before they allow their hearts to be hardened. Lots of “alternatives” can be tried for relief, but the only true relief comes from God with forgiveness (this forgiveness is pure charity [grace/mercy/Love]). The correct humble acceptance of this Forgiveness (Charity) automatically will result in Love (we are taught by Jesus “…he that is forgiven much will Love much…”). Sin is thus made hugely significant, so there will be an unbelievable huge debt to be forgiven of and thus result in an unbelievable huge “Love” (Godly type Love).
You really need to read the Gospels because this “Love” is defined by all Christ did and said.
This is just an introduction on the objective of man Love.
Refutation #2:
We will commit this sin and all other sins, but we are cleansed with Christ's blood whereas the angels were not.
This system is quite unfair and the other angels seem to be doomed to hell as an inescapable eventuality just the same as Lucifer. Also I am under the impression that God cannot be in the presence of sin (hence the forsaking of Christ on the cross), so this refutation makes little to no sense.
Atonement is really a huge subject and your conclusion would need a lot of work, I can assure you God is totally fair.
It all goes back to the objective of “Love” even for the fallen angels and that “Love” needing to be the result of a free will choice.
Refutation #3:
We will not sin in heaven because we will have no free will.
Then why do we have it now?
So let me know if I'm missing something.
We do have it in heaven also, without free will you cannot Love like God Loves.