(Point 1)From the LDS perspective, it is only through Jesus Christ that any human being is assured of being physically resurrected at some time in the future. This resurrection, we believe, will be universal. One need not be a Mormon, a Christian, or even a theist in order to be guaranteed a life after this one. We also believe that because of Christ's Atonement, all except a tiny minority of the human race (those who commit the one and only sin for which there is no forgiveness) will ultimately end up in Heaven, and will spend eternity im a far better place than where we now exist. (Point 2)We don't believe, though, that Heaven is a one-size-fits-all kind of place. In other words, greater faithfulness and greater obedience to Jesus Christ's commandments will result in greater blessings in Heaven, including the blessing of being able to actually live in God's presence as eternal families. Though we as human beings are responsible for living in such a way that we are deemed worthy of the greatest heavenly reward, none of what anyone can eventually look forward to receiving would be possible were it not for Jesus Christ.
I somewhat agree with point one on your explanation.
The "only through Jesus " is absolutely correct in that Jesus represents the new creation of what already exists.
For example you....and I. We were first made in the likeness of God, meaning that we have the ability to choose between two opposing forces.
The force for good and the force for evil.
Given that ability in the first creation, in the flesh, separated/separates us from God as gods therefore, death was the resultant. Spiritual death as well as physical .
So naturally, death befalls all mankind.
Because only God Himself could/can/did, correct the situation for the same by offering one individuals verses all of us to the "lost condition" due to the creation making.
That is why, for all mankind, Jesus is that one individual, as God, providing us with a way of escape from the pangs of eternal death. (Separation)
Jesus is the "New Creation" of which does not see death. (Spiritually speaking because He was God in the flesh)
Because He paid the price for all of us as an individual, (One) He then is the new creature of which we are/will be, if not now, eventually.
Regardless of the world's religions, and all unbelievers, the price for their souls has already been paid. So it matters not what you believe or you don't believe.
Many will believe while yet alive and spread the good news at a cost, and many will not believe at a loss.
As for point 2 in your explanation, I don't believe in graduations/degrees/levels or rings of closeness to God in heaven simply because there was no degree to the price paid by Jesus for our souls.
The price paid was the "sting of death" meaning, if Jesus had not paid the price, we, would die to nonexistence. That would have made this life of none effect and not worth the suffering and pain to live it.
But because life in the flesh is now worth the living because of hope, life then takes on a deeper meaning. One of appreciation amidst the sufferings and pain.
In the midst of hell, which I contend is this life, life eternal is born, love is born and who we are is born to live forever as us, and not just a mere drop in the ocean of souls, lost in the whole.
In this world everything has degrees, by human intellect, some things are better than others.
But in spiritual intellect, we are all the same, purchased and paid for in total as one.
What God has enabled us to do/be is have a fleshly body, experience suffering by reason of subjection , enjoy the benefits of choice as gods, and in and by which life is born.
Eternal Life is born not a at our birth of our flesh, but at the rebirth of our spirit.
All's the flesh does is define us as to who we are, and at death, well......only memories....that is, if they were worth the memorial.
The bible left us with this saying which tells us what are responsibilities are that we can control, that we can manage within the scope of our power, and that is "what you sow that shall ye reap".
As for the eternal part? That was never in our hands to decide.
Blessings, AJ
Without it, you will have never existed.