To dismiss what the constitution of a democratic country says as not mattering would be ludicrous. Of course it matters, that is why it gets enshrined in the constitution to begin with!

As to your other argument, you seem to me to be making an argument for keeping Israel ethnically pure or something? I don't know how much more "a real Jewish state" can be that to create a state religion by constitutional mandate. There is no other way to create a Jewish state I am aware of.

Or are you suggesting that the only legitimate way to have a state religion is for there to be a majority of people in said state as the citizens of the state?

Or are you suggesting that Israel should only allow people of Jewish faith to be Israeli citizens?

What exactly are you getting at here?