How many non-Muslims in a leadership position in Iran? Zero.
How many non-Jews in the Knesset? 11%.
How many nuclear weapons in Iran? Zero.
How many nuclear weapons in Israel? Well we don't have an official number because Israel refuses to admit they have them, but rest assured Israel has more warheads than every other Middle Eastern country combined. In fact if Iran managed to pump out a new warhead every year from here on out and Israel simply maintained their arsenal, the "arms race" in the region would not be even until just about the time Captain Kirk is alleged to have taken command of the star ship Enterprise.
Seriously...it would be the 23rd Century before Iran had as many nukes as Israel is estimated to have now.
As far as nuclear proliferation is concerned, Horatio is correct: Israel is a far larger problem than Iran. They actually have nuclear weapons, refuse to admit they have them, and refuse to join the rest of the international community in non-proliferation efforts. Israel is using this threat to back up their continued occupation of land which does not belong to them, annexation of territory outside of their borders, and any future conquests they might decide to undertake.
What territory has Iran taken over lately, again?