Sikhism vs religious belief

Sikhism and religious belief both are nouns.

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

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

Sikhism: the doctrines of a monotheistic religion founded in northern India in the 16th century by Guru Nanak and combining elements of Hinduism and Islam
religious belief: a strong belief in a supernatural power or powers that control human destiny

Other hypernyms of Sikhism include faith, religion.

Sikhism (noun)	religious belief (noun)
the doctrines of a monotheistic religion founded in northern India in the 16th century by Guru Nanak and combining elements of Hinduism and Islam	a strong belief in a supernatural power or powers that control human destiny