It’s my understanding that the Saudis realized a while ago that neither Israel nor Christians are the real enemies....they’ve realized that Iran is the enemy.
Your understanding is incorrect.
Saudi Arabia and Iran represent the two big sects of Islam - sunni and shia. Those sects compete - violently.
But any peace overtures to Christians and Jews (and everyone else) are contrary to the koran and are therefore taqiyya because they are only acceptable within the confines of taqiyya. Both shia and sunni believe that all governments must come under sharia law - that is the fundamental goal of islam (not personal conversion).
They believe you WILL be assimilated. After that shia and sunni will battle for final supremacy.