The schizoid nature of modern Hebrew

Hebrew is regarded as a former living language which ceased to be a native language 1800 years ago, only to be given a spoken function anew in the late 19th century. Since the re-acquisition of a lost colloquial function has never been documented, Modern Hebrew has become an object of fascination among linguists and laymen alike. In this book the author claims - Modern Hebrew is not a direct continuation of monolingual Semitic Hebrew - Modern Hebrew was created when Yiddish speaker re-lexified their language to Biblical and Mishnaic Hebrew - Yiddish is a Slavic language, derived from Sorbian and thus, Modern Hebrew is a Slavic Language These claims raise a number of interesting questions: why do most speakers believe that Modern Hebrew is a Semitic language, what are the contributions of Modern Hebrew to the typology of diglossia, historical and genetic linguistics, universal grammar, 2nd language acquisition and political science?