How long are you trying to sell that 'fear evil Atlantis' story to people?
I must say it worked great, but against some weaker players, that were quite easy to manipulate.
You have at least 3x more tartarians than Atlantis does. And I wouldn't be surprised if it was 10x more. You have huge squads of mind hunters, soul slayers etc.
Atlantis lead in research won't matter in couple turns anyway. And we all know how huge quality difference is between mages of Arco and Atlantis or Caelum. There are simply weaker and stronger nations in that game.