To those that believe his word, and do not look to reduce it to a fallible level.
Well whatever the subject every individual will be blasphemed at any given time.
"When was Lucifer created?"
That is not covered by the chronology we are given.
But Lucifer the first rebel was there in Genesis 2 and not one word mentions his creation, but yet Isaiah 14 and Ezekiel 28 both describe his creation. Check out for example Ezekiel 28:12 There Satan is called the king of Tyrus, (a bit of historical record for the student of history) we are told Satan sealest up the *sum*, full of wisdom, and perfect in beauty.
Verse 13 says that Satan was in the Garden of God, Eden... and then we get his past before the Garden of Eden, and even the only named entity that has been judged to death. So Genesis does not cover that 'time' before the 'soul/breath of life' was placed into a mortal vessel.
Peter says there are 3 different heaven/earth ages in IIPeter 3, and Paul says in Ephesians that some were chosen BEFORE the foundation of the world... Now these words 'foundation of the world' are actually a verb that means casting down / overthrow and the overthrow did not happen after the soul was placed in a flesh body.
"When did Lucifer rebel?"
It had to be after the six days of creation, because at the end of the sixth day, God said that it was "very good," which would have not been true if rebellion had occurred at that point.
It could not have happened after because there in the midst of the garden was the 'tree' (figuratively speaking) of the knowledge of good and evil. The very thing that God did not intend for his children in flesh to know or as Solomon says remember the pretty little snake made it his business to inform these 'new' flesh minds, and as I directed you to Ezekiel that describes the creation of Lucifer.
" Isaiah says that God did not create this earth void and without form... it became that way."
Sorry, that simply is not true. The Earth had to be without form at some point if it didn't always exist. (which it obviously didn't
Oh but it is true... Isaiah 45:18 For thus saith the Lord That created the heavens; God Himself That formed the earth and made it; *****He hath established it, He created it NOT in vain (very same Hebrew words used in Genesis 1:2) He formed it to be inhabited: "I AM the Lord; and there is none else. ...............NOT even that first rebel so many get enamored by.
You lay out only the human imaginary extrapolation that generated the absurdity that Genesis does not describe the creation.
Satan’s fall was after the creation of Earth and its inhabitants. God does not speak lies; the creation was “very good.” Imagine all you wish, but God’s word does not support that nonsense. Genesis covers the very invention of time.