After Jesus' return, an angel (Michael?)
descends, arrests and binds Satan in the Abyss.
(See Revelation 20.)
He is imprisoned there for a 1000 years so as no
longer to deceive the nations.
Still, many will be ready to follow him when he is
released at the end of the 1000 years.
Perhaps this episode is allowed by God to prove
that our basic human problem is our own
rebellion and not our environment.