mysticism vs religious belief

mysticism and religious belief both are nouns.

Word	Noun	Adjective	Verb	Adverb
mysticism	Yes	No	No	No
religious belief	Yes	No	No	No

As nouns, religious belief is a hypernym of mysticism; that is, religious belief is a word with a broader meaning than mysticism:

mysticism: a religion based on mystical communion with an ultimate reality
religious belief: a strong belief in a supernatural power or powers that control human destiny

Other hypernyms of mysticism include faith, religion.

mysticism (noun)	religious belief (noun)
a religion based on mystical communion with an ultimate reality	a strong belief in a supernatural power or powers that control human destiny
obscure or irrational thought