Now that is definitely not biblical. Lucifer cast out from heaven post 1914?before 1914 satan was sometime on the earth and sometime in the heaven , and as you say he was in the garden of eden , but after 1914 he was not allowed back into heaven any more he was cast out, so he is down here angry as can be . he cannot attack Gods kingdom up there any more so he is out to be in opposition to anyone down here who is for the kingdom ,and he is out to stop people putting their trust in Gods heavenly kingdom. and he is out to put people into doing things out of line with Gods ways .
but not for much longer because Jesus has the symbolic key to lock him away for 1000 years ,and then there will be no more opposition and Gods kingdom can rule without any opposition .we are now well along into the book of revelation and many things have been happening in this time of the end since 1914.
It would be one thing if JWs used their own doctrine for this set of circumstances...but to try to convey the bible as the prophetic where for all for the JW faith and apply specific dates no less... is ludicrous.
No one knows the end, but the Father, and He has made no one privy to that date...