I think it would have more effect on us rational atheists than the Christians. They already believed that crazy shit. The rational of us atheists that accept the proof (if it is indeed, proof) of Heaven and Hell would have to live with the fact that either we were going to suffer an eternity of Hell for non-belief/blasphemy, or, (assuming if there were also proof that the Christian God created Heaven and Hell, then "He" would have to exist as well ) rationally, accept that point so we could no longer be atheists. And maybe we would either commit suicide through despair at such a horrible theistic truth or suffer slaving our lives to a bullshit God belief that is now backed up with evidence.
EvF
EvF