He already gave that vision to John the Apostle.
The decode is available by a careful reading of the Prophets of old,
what the Apostles revealed,
and transferring that onto history as it has been unfolding,
starting from the time the Revelation was given.
Most of it has happened and has been ongoing since then through history.
Such a study is called "Historicism",
as opposed to the Jesuit disinformation campaign to shield the Papacy,
called "Futurism" or "Preterism",
the latter of which postulates the Antichrist was Nero,
while the former claims he's not yet appeared.