Mythology and national consciousness as a tool for uniting society

A Sabbath of peace
About a year ago, I heard a researcher (I don't remember his name) make an interesting claim about Jewish tradition and any religious tradition. I would love to hear the rabbi's opinion on the matter.
It is a well-known fact that every people needs two basic things.

1. It needs common characteristics that will bind it together for its unity.
2. Likewise, every nation needs a common goal. Otherwise, the nation will quickly fall apart.

Therefore, myths are often created among different peoples, usually expanding from general collective events, in order to get people in a nation to connect and cooperate for these goals.
And so, after the myth has become deeply ingrained in the people over the years, it turns the story into reality.

The same thing happened in a big way with the Exodus and the presence of Mount Sinai. It is very likely that the Israelites were indeed slaves in Egypt and left there. And over time they had already become a collective and a nation.
But the nation alone without a purpose cannot live well, so slowly metaphysical myths such as miracles developed, culminating in the giving of the Torah, to provide the overall purpose for the nation, just as every nation at that time had a theological system of commandments and idols.