God, they just don't believe Jesus was the messiah.
That there is but one God, creator of all things.
They don't all believe in the same thing. Do all the people in your country believe in the same thing?
I believe you mean Jews. Religiously observant Jews pray 3 times a day, every day and 4 times on Saturday.
Because we do not all believe in the same god.
Jerusalem
Rabbis and cantors
Israel
The is no such thing as a "judaism".
Jews worship in synagogues.
Judaism does not have a centralized leadership.
Belief in God and in the Torah.