Independence Day

The Ramban in the interpretation of the law says that we will not be left in the hands of the nations or in a wilderness. That is, Jewish sovereignty in the Land of Israel. So why is the day on which the commandment was fulfilled after two thousand years of exile a secular holiday?

The rabbi, including a possible haircut

Hallelujah with blessing?

A. Do you also allow head shaving?
B. Is Hanukkah also a secular national holiday. If not, then what is the difference?

Hallel at night with a blessing?

examination

Can you please address this to the manager?

For *

First of all, because there is no religious authority today that can fix a religious holiday. Indeed, both Hanukkah and Purim are secular holidays in this sense, but they have halakhic validity because the fixers had authority.
The Ramban is not a matter of slander, and that commandment was not fulfilled either, because the conquest of the land was not carried out by the people of Israel, but by a collection of Jews who did not intend the mitzvah. And even if the commandment was fulfilled, do you establish a holiday for it every time you fulfill a mitzvah? Furthermore, is there no significance to this day according to the Ramban?
It is certainly possible to say Hallel with a blessing. And in my opinion, it is also possible to get a haircut.

If there is no religious authority today that can fix a religious holiday, then why can the Chief Rabbinate fix the recitation of Hallel on this holiday? Apparently, this also requires religious authority, as is the norm.

First, who said there is no? A rabbi or a community can fix things for their community. But the Chief Rabbinate can't fix anything. They are just a collection of corrupt and pathetic officials. Not a rabbi or a rabbi.
Independence Day is a national holiday determined by public representatives. There is no obligation to do anything on it because the rabbinate determined it. Just like the American or Turkish Independence Day.