Will Jews and Christians eventually enter paradise?

We (muslims) always say that a muslim will enter Jannah if he has done good deeds and worshipped no one but Allah. Even if a muslims is condemned to Jannaham will eventually enter paradise for being a muslim. How does this go for the jews and Christians? Even though they do not believe in muhammad, they did believe in other major prophets & the books. Do they really need to be a muslim and believe in Muhammad in order to enter Jannah? Will they burn in hell forever or will they enter Jannah too if they have done good deeds? Or is it for a certain amount of time?