unbelieving vs irreligious

unbelieving and irreligious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unbelieving	No	Yes	No	No
irreligious	No	Yes	No	No

unbelieving (adjective)	irreligious (adjective)
holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible	hostile or indifferent to religion
denying or questioning the tenets of especially a religion
rejecting any belief in gods