What types of internal differences and divisions exist within Judaism faith?

The main difference is just their beliefs.

Beliefs in theology and philosophy.

Explanation:

Jewish religious movements, include different groups which have developed among Jews from ancient times.

Today, the main division is between the Orthodox, Conservative, Reform, and Reconstructionist movements.

Another classification is between Haredi Judaism, Religious Zionism, Masortim (traditional) and Hiloni (secular) Jews.

The movements differ in their views on various issues. These issues include the level of observance, the methodology for interpreting and understanding Jewish law, biblical authorship, textual criticism, and the nature or role of the messiah (or messianic age).