Kuzari Principle

 https://ohr.edu/3577

The Jewish claim to truth is based on the idea that G-d revealed Himself to the entire people at Sinai which was an experience so great and so intense and so unanimously experienced by all that it could not have been made up. This imparted in the Jewish people an unswerving commitment to the belief in G-d. Subsequently they may have lapsed into rebelling against His will, but their acceptance of G-d’s existence was not questioned.

Compare this to other religions’ claim to truth based on the spiritual experiences or insights of one person, or of just a small group of people. This experience cannot be corroborated in any way by others. Of course, the experience may have happened. But the difference is that translating the experience of the individual to a national “belief” is based solely on faith in that individual and accepting his claims despite having no other verification.