Well...today, I wanted to expand on the hierarchy of the afterlife.
At the top, you have God. God is an entity which, loosely speaking, is every soul in existence while simultaneously separated from them all. (God transcends space and time.) As such, God has no gender. However, being formless, God can take any form expected. Now, in the modern world, most people refer to God as a 'Him'. Thus, most of the time, when God takes form, it's as a He. (Frequently an old guy with a beard at that.)
God subtly will give hints and suggestions to help people, and as much as possible, will shine favorably on them, but ultimately, God is not able to defy the lows He made, only bend them, so He cannot stop all misfortune from happening. Rather...he can, but it'd ONLY be possible by SEVERELY tampering with free will, and God is the ultimate avatar of two things, interconnected: Love, and Free Will. Thus, he will not intervene. He's extremely hands-off: while he'll offer hints to better people's lives, it's up to them to correctly interpret them, AND up to them to actually act.
...That said, God will occasionally take avatar form as a human usually, to get the 'in the moment' feel of humanity. However, said avatars are not proper reincarnations of God, as portrayed of what Jesus is in the Bible. (If asked whether Jesus was a reincarnation, he'll give a literal Shrug Of God.) His mostly hands-off policy leaves the work to his underlings unless absolutely necessary. (Thusfar, there has only been once in history requiring His intervention.)
Under God is Lucifer, the Great Reaper. He rules over Hell, but is actually one of only two willing residents. (The other is Lilith, his secretary.) This might seem unusual, but he is THE most pious, loyal, devoted, holy forces of God, His most-trusted servant. This is because, again, God is all-loving. Lucifer was His first angel, and once Lucifer recovered from his insanity, his regret gave him a deep-seated need for atonement. Having long-since been forgiven, he now serves as a warden (basically an officer of the heavenly law), overseeing Hell, the jail for souls.
Lucifer has two subordinates: Lilith, first wife of Adam, sees herself as Lucifer's little sister. She is fiercely loyal to him as a result, having a strong bond. As a willing resident of Hell, she can leave at will, mainly on visiting trips to see her other 'sister', Eve, but she primarily stays, as a head secretary tackling the various paperwork in Hell. Being a pure entity of extreme age, she is Michael's equal, albeit a noncombatant.
Michael, former archangel, also considers himself Lucifer's younger sibling, albeit for different reasons. (Lilith for mortal time, Michael for immortal time.) He is the ultimate champion of 'Good', thus, he interferes in free will too much to be an angel, because part of free will is the choice, the option, to do bad. As such, he's a rebel to God, but affectionately so: they both want the same thing; Michael is just a believer in being active rather than passive. As God's former champion, he's the one who snapped Lucifer from his insanity. Currently, he oversees all reapers.
On Heaven's side, equivalent to Lilith, we have Eve, second wife of Adam. She's the lead secretary (there are many others) of Heaven, overseeing paperwork. Like Lilith, she is equal to Gabrielle in power, but is a noncombatant.
Gabrielle, AKA Gabby, is Michael's equivalent. (Gabby considers herself a sibling of Michael, currently a sister, and by extent, Lucifer, too, but is estranged from Luke. Mike, not so much; she actively interacts with him constantly.) Following God's will to the letter, she is His latest champion. As such, she is equivalently the strongest angel, by both age and her actions.
You might have noticed Adam was mentioned--there's a complicated story behind him which only seven entities know the entirety of: Lilith, Eve, Lucifer, Mike was told by Lucifer, Gabby was told by Mike, Adam, and God Himself.
Basically, Adam was not the first man. (If anyone has that honor, it would probably be Lucifer.) However, Adam is the oldest man that every currently-living human being is descended from, and God knew this was his destiny. Adam was not monogamous, having several consorts and, eventually, three wives.
Lucifer was sent to protect him, but Lucifer fell in love with Eve. Jealous of Adam, Lucifer tried to draw Adam away from Eve by manifesting as Lucy for the first time. However, ultimately, she ended up legitimately loving Adam, and became his third wife. This level of interference, as you might have gleaned, is a blatant violation of angel duties, and the conflict is what drove Lucifer insane in the first place: the divide between Lucifer's duty and Lucifer's feelings drove Lucifer insane.
This is where sin originates from. For clarity, Adam was most certainly not in a garden of Eden. There were other humans around. Death, disease, even war existed back then. But it was all in the name of survival and furthering your genes: if two brothers both loved one particular woman, it wouldn't have been considered a sin for one brother to kill the other. It'd be considered survival of the fittest, natural selection.
...But with Lucifer's insanity came crimes that had no basis in survival; they were done out of madness, and humanity became corrupted as a result of Lucifer's derangement, for which, Lucifer eternally feels shame...within reason. Lilith was deeply hurt at the time, but forgave him, and so too did Eve. They have told him multiple times to forgive himself, so reluctantly, he's capable of putting it aside for their sake, but he still remembers his crimes vividly.