Can A Jew Read The Book of Enoch?

Is the Book of Enoch a Jewish book? christians LOVE it! Masechet Sanhedrin 90 says anyone that reads Sefer Chanok or anything like it has no Olam HaBa. Rabbi Yaron Reuven brings chiddushim on Pirkei Avot 5:2 that show HaShem's patience before punishing heretics and idol worshippers in the Flood in this week's Parasha.