What is wrong with the gap theory: The Book of Genesis, there was a perfect world to start with described by God as “very good” (Genesis 1:31)—but it was marred because of Adam’s rebellion. Sin and its consequence of death entered the world that was once a paradise (Romans 5:12, 8:20–22; 1 Corinthians 15:21–22).
Rom.5:12 is about 'death' being assigned to Adam because of his fall, not about the creation falling.
Rom.8:20-22 doesn't say the creation was made subject to vanity because of Adam's fall. If you believe Adam's fall also applied to God's creation, then you are admitting that God had made a previous perfect creation before Adam. I wish you folks would think about what you're saying, instead of just regurgitating what you've heard.
1 Cor.15:21-22 is also only about Adam's fall and suffering the penalty of death, not about the creation. And actually per God's Word, death was first assigned to the Devil when he fell. So when was that when Satan was assigned the power of death?
What you've actually done mcubed is simply misuse those Bible verses just so you could push an idea not written in God's Word, for there is no Biblical evidence that the creation was placed in bondage at the same time when Adam fell.
Heb 2:14
14 Forasmuch then as the children are partakers of flesh and blood, He also Himself likewise took part of the same; that through death He might destroy him that had the power of death, that is, the devil;
KJV
So if one is going to try to use the idea of death coming in as proof of when God placed His creation into bondage, then it would have to have been when Satan fell, since that is when the power of death was first assigned and came into existence.
Did anyone also notice at the end of Revelation 20 that "death" is finally destroyed after Satan is destroyed and when hell goes into the "lake of fire"?