what were the main believes of the people who lived in masada?

Answer 1

From wikipedia:

According to Flavius Josephus, a First century Jewish Roman historian, Herod the Great fortified Masada between 37 and 31 BCE as a refuge for himself in the event of a revolt. In 66 CE, at the beginning of the First Jewish-Roman War (also called the Great Jewish Revolt) against the Roman Empire, a group of Jewish rebels called the Zealots (kana'im, "zealous ones", commanded by Elazar ben Ya'ir (who may have been the same person as Eleazar ben Simon), who objected to Roman rule of Judea (as the Roman province of Iudaea, its Latin name) took Masada from the Roman garrison stationed there. After they persuaded the Romans to disarm[citation needed] they then slaughtered every man of it. In 70, they were joined by additional Zealots and their families who were expelled from Jerusalem by the other Jews living there shortly before the destruction of Jerusalem (and the Second Temple), and for the next two years used Masada as their base for raiding and harassing Roman and Jewish settlements alike.

Answer 2

That the Roman occupation needed to end.

Answer 3

They were Jewish; believing the things common to Judaism.

Answer 4

They were Jewish suicide stabbers, hackers & slashers.