Answer:
Belief and salvation theories are same while type of holy book and number of sub divisions are different
Step-by-step explanation:
Similarities -
Their beliefs were the same as these three religions believed that there was only one God who may exits in different forms and salvation can be achieved by doing good works
Difference - They all had holy books such as Bible (Christianity), Kuran (Islam) and Hebrew Tanakh (Judaism)
Christianity has three divisions (Orthodox, Protestant and Roman Catholic), Islam has two main groups (Sunni and Shia) and Judaism has several divisions.