Despite shared scripture, why is Judaism so different from Christianity?

These two religions share the Tanakh, yet the more I’ve learned about Judaism the more I’ve learned that it’s completely different from Christianity. Some examples are like there is no Hell in Judaism, Satan isn’t a fallen angel who rebelled against God, humanity isn’t born in sin because Adam and Eve ate the forbidden fruit, Judaism has some characters that Christianity doesn’t have like Metatron. These are just few examples, I’ve heard tons of other ones too.