During the millennium Satan will be removed, but man will still reject Christ. In your opinion would Adam and Eve or one of their offspring have eventually sinned even if Satan had been bound?
Adam and Eve were created without a sin nature, so the Serpent had to trick Eve into sinning. I don’t think she or her husband or her children would have sinned if they’d been left alone. After the fall mankind inherited a sin nature which makes it impossible to keep ourselves from sinning. Therefore even though Satan will be bound during the Millennium, natural man will be unable to stop sinning and will reject the Lord without Satan’s help.