No, Israel is not using religious norms or holy scriptures as the law, and establishes no state religion. Iran's constitution directly says that the norms of the Sharia law are its foundation, and makes Shia Islam the state religion.
The Basic Laws, which sort of comprise the makeshift constitution of Israel, don't seem to make any religious references, but rather refer to the founding UN principles like human rights.
Even civil courts are allowed to refer to holy texts if the law is not clear.
could you please show me any law in israel, that gives blanket approval to civil courts to refer to holy texts if the law is not clear ?