You could use similiar descriptions for cult and religion, but we should break it down a bit before we do.
We should look at the etymology I would think firstly and see if there is any differing considerations to be made between cult and religion.
cult (n.) 1610s, "worship," also "a particular form of worship," from French culte (17c.), from Latin cultus "care, labor; cultivation, culture; worship, reverence," originally "tended, cultivated," past participle of colere "to till" (see colony). Rare after 17c.; revived mid-19c. with reference to ancient or primitive rituals. Meaning "a devotion to a person or thing" is from 1829.
religion (n.) c. 1200, "state of life bound by monastic vows," also "conduct indicating a belief in a divine power," from Anglo-French religiun (11c.), Old French religion "piety, devotion; religious community," and directly from Latin religionem (nominative religio) "respect for what is sacred, reverence for the gods; conscientiousness, sense of right, moral obligation; fear of the gods; divine service, religious observance; a religion, a faith, a mode of worship, cult; sanctity, holiness," in Late Latin "monastic life" (5c.). According to Cicero derived from relegere "go through again" (in reading or in thought), from re- "again" (see re-) + legere "read" (see lecture (n.)). However, popular etymology among the later ancients (Servius, Lactantius, Augustine) and the interpretation of many modern writers connects it with religare "to bind fast" (see rely), via notion of "place an obligation on," or "bond between humans and gods." In that case, the re- would be intensive. Another possible origin is religiens "careful," opposite of negligens. In English, meaning "particular system of faith" is recorded from c. 1300; sense of "recognition of and allegiance in manner of life (perceived as justly due) to a higher, unseen power or powers" is from 1530s.
It would seem the term cult is coined much later than the term religion, both reserve a sense of worship, while religion renders a sort of piety to it, but I imagine cults do as well.
I would consider the ancient Israelite's a cult as well the cults of Uruk and Babylon.
Of course there is a pejorative outlook when it comes to the Abrahamic religions outlook on Non Abrahamic religious view points. I would think that the term cult has a negative connotation, not on its own of course. It would be how society of a particular country, state, so on determine their outlook on a cult and or a religion.
I personally do not divide a difference between a religion and cult, both in modern times can be tax exempt if they choose to serve a communal purpose, could be either considered a religion or a cult.