Like most ragheads they are long on talk and short on action when it comes to attacking the Israelites. IS would get their arses handed to them in a bag.
It all depends upon what you want to believe, some say the are being funded by Turkey or The Russians.
I'm contrary and I'm interested in armed forces and how good/bad or indifferent they are. Whether you like them or not is irrelevant, the Israeli Armed Forces are superb fighting men, their record in wars is very impressive. Does not mean i have to like them but I can admire them and their military effectiveness. Thoughout history there have been exceptional armies, from the Spartans, Carthage, the Macedoneans, the Roman Legions, the *****ls, the British, and the Germans and Finns during WW2. I may not be a fan of their politics but they were warriors, just like the Israelis. If IS or Daesh or whatever attacked Israel they would (I suspect) meet the same fate every other army Israelis have taken on did. Hence they would get their arses handed to them. Maybe I'm wrong though ,maybe IS will attack and wipe them off the face of the earth and maybe IS are being sponsored by Israel so won't attack, either way I can live with it.