Your questions are getting more interesting, @RedDeerGuy1. I usually shy away from speculative and unanswerable questions, but sometimes it’s fun just to see the reach of them.
ISIS reportedly advocates the idea that the apocalypse is imminent and that Islamic State fighters will battle the “infidels” of the West in Dabiq, a Syrian town now under ISIS control.
Why would they side with anyone?
They just have to hunker down and kill anyone infected by Zombies or Infidels.