A Jewish adjective refers to something related to Judaism. A proper noun (Jew) is the basis for the English word, which is always capitalized. There is no language for Jews.
Do You Capitalize The Word Jewish?
Religions. The religions of the world. Identify the major religions, their adherents, and the adjectives derived from them: the Anglican Church, Anglicanism, Buddhist, Buddhism, Catholic, Catholicism, Confucian, Confucianism, Hindu, Hinduism, Judaism, Protestant, Protestantism, Roman Catholic Church, etc.