'If push comes to shove'(a situation becomes very difficult or critical, requiring you to take serious action or make a hard choice) the US will side with Israel,
The ME has no choice but to come together in mutual defence and that includes Iran, Like the Irish Catholics and Protestants, who had to put their religious war behind them
Yo Pops ! Your likening an internal dispute to a civilizational clash tells us all we need to know about your knowledge on the topic.
Shia's & Sunnis have been at each other's throats for the leadership of Islam right since its inception. This isn't your catholic vs protestant theology war about who's right ? This is about who gets to set the agenda for Islam.
So Iran & KSA can come to some sort of temporary understanding on a limited set of issues of which Israel isn't one since the US won't permit it & if KSA goes around the US to strike such a deal it loses the US security umbrella.
The Mullahs would see destruction of the House of Al Saud & installation of their own puppet a much more attractive prospect not to mention also a more feasible prospect than taking on the collective might of Israel & the US.
Ditto for the civilizational clash vis a vis the Arab Israeli conundrum in which the Turks having stayed out since the birth of Israel , are now jumping in . However barring Iran which doesn't share a border with Israel none of the other countries want to take up cudgels against Israel irrespective the view on the street.
In this respect Egypt needs to be watched since the army there hasn't delivered much in spite of being in power for more than 7 decades. If the army is overthrown , the only other organisation which can lead Egypt is rhe Muslim Brotherhood. And that's not good news at all for Israel or the US.
Throw in Turkey in an alliance with Egypt & that's really bad news . However while there's a strong possibility this may come to pass that's not the case right now. Hence by opening his cards prematurely Turdogan has invited Israel to undermine himself & his administration which Israel will attempt backed up by the US.
Interesting times ahead for the ME & the world at large. Missing the action down under instead of enjoying your retirement guzzling Foster's by the dozens & gorging on pizzas Pops ? Hell get your a r s e down to Syria & take on the Zionists you so hate I say.