Answer:
The characteristic that is shared by Judaism, Christianity, and Islam is that each of these religions is monotheistic and believes in only one god.
Explanation:
Monotheism is the belief in a single God, often with the gifts of omniscience, omnipotence and omnipresence. Nowadays the concept is usually dominated by the Abrahamic religions (Judaism, Christianism, and Islam) and contrasts with other traditions such as polytheism or pantheism.
In spite of the definition of the term some religions can incorporate variations as far as the uniqueness of the divinity. Most Christians accept the concept of the Holy Trinity in which God is encompassed in three personalities (father, son and holy spirit). Catholics also venerate the Saints who, despite not being deities, believe they can magically intercede in the lives of humans.