Abaddon is secretly none other than the Lord All-Mighty

 Simply follow this train of thought:

 Mythologically speaking, the Great God Pan (Greeks) is Cernunnos (Celtics), is Lord Pashupati (Vedic Civilization), is Lord Shiva (Hinduism), all deeply connected through the symbolism surrounding the LHC over at CERN (plenty written about that everywhere already), and CERN-unnos, Shiva, are directly connected to Abaddon/Apollyon through the location of the LHC itself, where an ancient temple devoted to his worship used to be. In Judeo-Christianity, Abaddon/Apollyon is not only the "angel" of the Abyss/bottomless pit, but also the key, the guardian and the bottomless pit itself; in other words, he is what Lovecraft attempted to describe as Yog-Sothoth, eternity given form, the key, the guardian and the "gate" between worlds as one, where the spheres meet, always on the verge of unleashing cosmic horrors upon humanity when the end comes.

 In the Book of Revelations, it is clearly implied that Abaddon is, by far, the most powerful being in all of creation, moreso than the archangel Michael and Jesus Christ. Where? Chapter 20, verses 1-3, the angel of the Abyss intervenes to lock up Satan for a thousand years. When both the archangel Michael and Jesus Christ want to subdue Satan, they have to go to war with all of their followers, the biggest wars both Heaven and Earth have ever seen. Not Abaddon. He simply takes Satan, effortlessly, without struggle, chains him up and casts him down into the Abyss; Abaddon is, by definition, all-powerful. Not to mention that according to certain Apocrypha (especially "The Enthronement of Abbaton" by pseudo-Timothy of Alexandria), the veneration of Abaddon alone ensures salvation in the afterlife, for he alone is feared by both angels and demons alike.

 You have to ask yourself: Who is more powerful than Michael, the Son of God and Satan combined? Who is "The Eternal" (Yahweh can literally be translated as "past, present, future as one", the same as Yog-Sothoth)? Who can offer both spiritual salvation and apocalyptic annihilation at will, without Jesus being involved, since he's above Jesus in power?

 Well, as we established way at the beginning, Abaddon is merely another, more subtle name for the Great God Pan. Jesus is man/good/light personnified, Satan is goat/evil/darkness. Pan is both man and goat, good and evil, light and darkness as one, both the Creator and the Destroyer, and just as Abaddon and the Christian God, he is feared by all who know Him, for to see Him is to die.

"Ask not for whom the bell tolls, it tolls for thee."

 After my six-hour long near-death experience over eight years ago (in which I entered a state of indescribable communion with the Great God Pan in his highest cosmic form, up at the sephira Chokmah of the Tree of Life, contrary to my expectations, which were either Jesus or Solaris), my mother told me that the first time she came to visit me at the hospital, right after surgery when I was practically comatose, she clearly heard her sister's voice coming out of my mouth, as if I was nothing more than a speaking tube. My aunt was telling her "I'm so sorry, I was so selfish, I'm so sorry..." over and over again.

 That freaked my mother the f**k out, so much so that she was still very deeply disturbed even a year afterwards. I naturally DIDN'T tell her about my whole experience on the other side, the part when I fell into Pan's endlessly spiralling ram's horns, literally made of stars, and ended up walking down a spiral staircase made of black stone. Not a proper staircase really, simply steps made of obsidian or more probably onyx, floating above oblivion. After quite some time walking down the onyx steps, I found my aunt completely listless on the stairs (she had also violently commited suicide five years earlier), and she said "This is the abyss, the bottomless pit, where all of the lost souls end up, I've been here forever, there's no escape, I'm more lost than ever, I've just lied down and given up." Without thinking, I took her hand and replied "You're not lost anymore, I've found you." She looked up, her eyes full of life again, and said "James, I love you, I love you so much..." and that was it, next thing I remember was waking up at the hospital days later.

 About a month later, I was at the public library, when I noticed a tall, young, beautiful woman looking at me, smiling. She looked familiar, but I couldn't remember who she was. She came up to me and asked "You look familiar, do I know you? Tell me your name." But I felt so incredibly uncomfortable looking at her face up close, it didn't seem right. In retrospect, it was like when they digitally de-age an actor for a Marvel movie; yeah, it technically looks perfect, but there's just something... "off" about it, too perfect. So I just told her "No, I'm sorry, I'm not going to tell you my name." and she just whimsically replied "Okay." AS SOON AS SHE WALKED AWAY, it suddenly hit me that she obviously was my aunt, looking as she did in my childhood, when she was in her twenties. When I turned around, she literally disappeared.

 I rationalized it as an unintentional "Orpheus travelling to the Underworld to rescue the soul of a loved one" sort-of-thing, but more successful. Haven't seen her since.