Obama would order a neutral sounding tactic such as a complete no-fly zone that would hamper Israel’s efforts at self-defense. And win another Nobel for it.
Transgressions by Iran would be ignored. Israel would eventually have to break the no-fly zone, too. Obama would then order the shoot-down of Israeli planes.
The short term pieces after that are fuzzy, but the end game is WWIII.
And no, Israel no longer has any choice but to go down this road...
Re #3:
I fear you may be correct. Obama IS MUSLIM. He will not help Isreal but will try to shield Iran.