One last thing to think about on the matter.
The church tells us that Satan was once a perfect angel of light.
The bible tells us that satan can transform into an angel of light but he was evil to the core from the very start.
Which should we believe here?
I am not sure what you call the 'church' , did you have a reference?
but it is Paul who says
"2 Corinthians 11:14 And no marvel; for Satan himself is transformed into an angel of light."
John who says
"John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it."
'evil to the core' is a phrase I cannot find in my bible ... it would help if you gave some references
But your problem may simply be the common problem that folks have who think in purely logical terms, hyperbole ... just as " all men are sinners" does not imply Jesus was a sinner but is just a hyperbole, a convenient generalisation which applies to overwhelmingly many , so talking of the 'beginning' doe not necessarily imply tht Satan murdered someone the moment he was created... we know that he was twisting the truth already in the garden at the 'beginning' and that lies lead to death for sin... so maybe it is justa question of understanding both the situation and the sweeping use of language when it is used 'poetically' to make a general point ... te bible is immensely poetic , something we lose in translation, but Hebrew's play on words and idioms are simply awesome poetry no man can match God's word for , vastly more intricate than Shakespeare for instance...
dissect it logically and one an get into all manner of logical problems which do not exist anywhere except in the minds of those who think language is not poetic...
Hebrew in particular has but a thousan or so word roots, it is a tiny language, an so forced into its rather beautiful poetry because each word has to be used countless different ways... in fact we cannot now recover most of the idioms necessary [and unnecessary but poetic] for the language has changed, it is not that much like modern Hebrew and idioms are fashions to large extent...
As for it being the end, I doubt that , nor do you say whether you understand that the only king/prince of Tyrus [which has its own history in scripture with many more clues] that was in the garden and walked among the stones of fire , is indeed Satan... but mybe you are stil thinking about that ...
as for cherubs [Heb plural 'cherubim' , not 'cherubims' as in much scripture] they do indeed bear the face of a man just as Jesus and Satan are recorded a doing , also the face of cherub, also the face of a lion [which opens muh scripture ] , and there is much more in the symbology of the cherub statues at the throne of God
and their relation to the temple and the priests, forerunners of the congregation of God ...
I have doubts that anyone can reach the end of the wonders of scriptural imagery/poetry until spirit baptism's complete truth of the future and the past... but who is ready to know themselves and all that now , very few indeed , as Jesus and the saints point out to us... [Matt 7:14, Rev 7:3-8]
nah, it's quite a long way yet I think, and I do not detect the antichrist Satan explicitly ruling the whole earth yet, but a few men do own much of the world and they truly own most souls [lives] through the bigget con trick mankind ever worked [central banking laws whch rob everyone of their just rewards for labour , make the few ever more powerful over billions of blinded/foolish men and religion , and as side effect are destroying our earth in almost every way except God's final way ...