Most here are trying to use man's philosophical type thinking to explain the matter, which will not work.
If brethen do not Biblically understand what it was that Lucifer did in that 'old world' when he first rebelled in coveting God's Throne, then they will not understand how evil and death entered in. The main reason this is so is because with God's parable in Ezekiel 28 using the "king of Tyrus" as a TYPE for Lucifer in the old world, it reveals that God originally created Lucifer "perfect in his ways".
Lucifer was created a covering cherub, meaning his job was one of those winged creatures shown on the Ark of the Covenant model that was made to guard God's Throne (Ezekiel 28:14-15). Lucifer instead rebelled, and wanted to be GOD, thus coveting God's Throne for himself. That was the real first original sin that happened, as Apostle John even said that the devil sinned from the beginning (1 John 3:8).
Now the way 'how' Lucifer could sin, is about the idea of God having given the angels also the power of free will choice, and did not make the angels as robots. Thus 1/3 of the angels also sided with Lucifer in that old world and rebelled with him per Rev.12:3-4.
When you point to that “old world” I think of
Galatians 1:3-4 Grace be to you and peace from God the Father, and from our Lord Jesus Christ, [4] Who gave himself for our sins,
that he might deliver us from this present evil world,
according to the will of God and our Father:
It doesn’t say according to the will of men. It says “according to the Will of God and our Father”. And I also don’t get what you are referring to as “that old world”. I see that “old world” as that “old world” in by whom that “old world” is crucified unto me (Saul), and I (Saul) unto the world. For in Christ Jesus …Galatians 6:14-15 But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world. [15] For in Christ Jesus
neither circumcision avails any thing, nor uncircumcision, but a new creature. (Paul). Not that it doesn’t speak to us also but it helps (Imo) to see the difference in Saul/Paul who spoke of that old world which was crucified, and what it pertains to.
Ephesians 1:21 Far above all principality, and power, and might, and dominion, and every name that is named,
not only in this (Old) world(passing away), but also in that (New World) which is to come:
Ephesians 6:12 For we wrestle not against flesh and blood, but against principalities, against powers,
against the rulers of the darkness of this world, against spiritual wickedness in high places.
That shows the “old world” of spiritual wickedness(seated) in high places…exalting itself above the knowledge of God.
Hebrews 6:5 And have tasted the good word of God, and
the powers of the world to come,
In regards to the “powers” of the world to come, having tasted of the kindness of the Lord: 2 Timothy 1:7 Lexicon: For God has not given us a spirit of timidity, but of power and love and discipline.
I’m not sure what you consider “that old world”. To me it’s a mindset. Interesting he was appointed
a covering cherub
1 Corinthians 11:15-17 But if a woman have long hair, it is a glory to her:
for her hair is given her for a covering. [16] But if any man seem to be contentious, we have no such custom, neither the churches of God. [17] Now in this that I declare unto you I praise you not, that
you come together not for the better, but for the worse.
1 Peter 2:16 Act as free people, and do not use your freedom
as a covering for evil, but use it as bond-servants of God. —for the removal of the cloak of maliciousness
A whole study could be done on
appointed as a covering. I’m sure it would lead into taking off the “old” ways of that “old world” “covering”…
And putting on the New of that (world) which is come; which fruits are by Jesus Christ. Be clothed in…? Luke 20:34-36 And Jesus answering said unto them,
The children of this world marry, and are given in marriage: [35] But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage: [36] Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
Love: 1 Timothy 6:8 If we have food
and covering, with these we shall be content.
Being not covered in own righteousness(not my will), but covered by the righteousness of God(His Will be done). <what Paul hoped for.