Maybe a reply from an agnostic would be in order, one that has done a little studying on the topic of religion.

To me it seems the most likely idea of Angels is that of them being someone who either has lived on the earth or will live someday. There is a popular test if you ever meet one. It’s called the handshake test…
This will distinguish a “raised” angel, a fallen angel and a pre-mortal being. This means that Angels are as free as us to make choices. The raised angels have already chosen a good life and have been rewarded for it. The fallen angels were cast out of heaven for their choice of following Lucifer. The pre-mortal beings chose to follow Jehovah and will soon enjoy a life on this world making their choices again.
You see, if there is a difference in God’s angels and Satan’s angels and that at one time they were all the same, they at some point were free to make a stand or choice if you will. Hence, angels have free will.
I read somewhere that at one point, Lucifer, the Angel of morning light (a rank of some esteem) third in line after Jehovah and Michael, proposed a misguided plan yet necessary for the original and eternal plan to work; that no one should have the freedom to chose evil. All should be compelled to live the law of heaven and receive their exaltation. “Give me the glory for this”, was what brought him down. One third of the heavenly host agreed. A war of words ensued which resulted in the one third being cast out. The original plan was executed and a world was created. The Angels of power helped and one of them became the first man. Lucifer got involved and made man mortal as was according to the plan. I can’t exactly remember where I read this but Lucifer complained to Jehovah when he was accused for the deed of presenting the forbidden fruit to man: “You can not damn me for this, as this is a necessity for the progress of the original plan. This has been done many times over on other worlds”.
So what I can fathom of Christianity is that this whole charade, the world which we live on, the church, freedom of choice is just a necessary step to progress from a state: pre-mortal, to a state of exaltation. A big test to see if you truly are exaltation material. Oh, you got your memory wiped upon coming here, just to make it fair for everyone.

As to hell, I have compiled something that is taken from my own words based on own studies and that of a LDS scholar who happens to be in alignment with my understanding of this:

Hell, Hades, Sheol, Gehenna, Tartarus…

Outside Jerusalem lays the Valley of Hinnom or Gehenna. In ancient times this place was used to sacrifice infants to the God Molech. This place became a sinister remembrance to the atrocities committed there and was called the valley of slaughter. Later this place was further desecrated as a garbage heap and a place where bodies of criminals where thrown out. To prevent pestilence, ever-burning fires were kept smoldering in this infested refuse. I perceive it was from this picture the prophetic mind used Gehenna to signify the burnings, the torment, the anguish and unspeakable horrors of hell. It is frequently mentioned in the Bible as synonymous to hell. I also believe that Gehenna later was replaced by the word hell and repeatedly used as scare tactic to further the cause of a growing religion.
It is interesting that the other words; Hades (Greek for hell), Sheol (Hebrew) signifies the abode of resting souls. Ergo the grave; a temporal place of dwelling bereft of all that is physical. It is hell because they know they have lived a life which will possibly not qualify. It is however not an eternal place. Maybe this became purgatory in a later hotfix. The last word Tartarus (greek) was used by Peter in one place in the NT (2.Peter 2:4) to differentiate between Sheol, Hades, Hell and a place where fallen angels dwell. To me this enforces the underlying plot of older Christianity that states; all men (people) that have ever lived on this earth will be resurrected and receive an eternal body like their God.