Religious, besides meaning "having to do with religion," can also mean "acting as if something is a religion." If you have never missed a broadcast of your favorite TV show for the last five years, then you're religious about it.

Just as religion is a broad concept with multiple manifestations, the word religious can be used in many contexts. You could literally be describing someone's particular religious duties as prescribed by his religion. If you have a religious temperament, you think about spiritual things a lot. If someone is a fanatic about football, you could describe him as a religious fan. That doesn't mean he thinks the football is God, just that he really, really cares.

Definitions of religious
  1. adjective
    having or showing belief in and reverence for a deity
    “a religious man”
    religious attitude”
    having or showing or expressing reverence for a deity
    actively practicing a religion
    resembling or suggesting or appropriate to a church
    devout, god-fearing
    deeply religious
    involving persons of different religious faiths
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    hostile or indifferent to religion
    lacking piety or reverence for a god
    atheistic, atheistical, unbelieving
    rejecting any belief in gods
    ethnic, heathen, heathenish, pagan
    not acknowledging the God of Christianity and Judaism and Islam
    lapsed, nonchurchgoing
    no longer active or practicing
    failing or refusing to observe religious customs
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  2. adjective
    concerned with sacred matters or religion or the church
    religious texts”
    “a member of a religious order”
    synonyms: spiritual
    concerned with religion or religious purposes
  3. adjective
    of or relating to clergy bound by monastic vows
    “the religious or regular clergy conducts the service”
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    of or relating to clergy not bound by monastic vows
  4. adjective
    extremely scrupulous and conscientious
    religious in observing the rules of health”
    having scruples; arising from a sense of right and wrong; principled
  5. noun
    a member of a religious order who is bound by vows of poverty and chastity and obedience
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    Thomas Merton
    United States religious and writer (1915-1968)
    Roger Bacon
    English scientist and Franciscan monk who stressed the importance of experimentation; first showed that air is required for combustion and first used lenses to correct vision (1220-1292)
    Saint Benedict
    Italian monk who founded the Benedictine order about 540 (480-547)
    Saint Bridget
    Irish abbess; a patron saint of Ireland (453-523)
    student and mistress and wife of Abelard (circa 1098-1164)
    Gregor Mendel
    Augustinian monk and botanist whose experiments in breeding garden peas led to his eventual recognition as founder of the science of genetics (1822-1884)
    a British or Irish monk who denied the doctrines of original sin and predestination and defended human goodness and free will; his views were declared heretical by the Council of Ephesus in 431 (circa 360-418)
    Girolamo Savonarola
    Italian religious and political reformer; a Dominican friar in Florence who preached against sin and corruption and gained a large following; he expelled the Medici from Florence but was later excommunicated and executed for criticizing the Pope (1452-1498)
    Agnes Gonxha Bojaxhiu
    Indian nun and missionary in the Roman Catholic Church (born of Albanian parents in what is now Macedonia); dedicated to helping the poor in India (1910-1997)
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    friar, mendicant
    a male member of a religious order that originally relied solely on alms
    monastic, monk
    a male religious living in a cloister and devoting himself to contemplation and prayer and work
    a monk or nun belonging to the order founded by Saint Benedict
    a member of the Jesuit order
    a woman religious
    a Christian recluse
    cenobite, coenobite
    a member of a religious order living in common
    the head of a religious community
    one bound by vows to a religion or life of worship or service
    abbess, mother superior, prioress
    the superior of a group of nuns
    abbot, archimandrite
    the superior of an abbey of monks
    (Roman Catholic Church) a title given to a monk and used as form of address
    a member of the Carthusian order
    the head of a religious order; in an abbey the prior is next below the abbot
    anchorite, hermit
    one retired from society for religious reasons
    (Roman Catholic Church) a title given to a nun (and used as a form of address)
    Cistercian, Trappist
    member of an order of monks noted for austerity and a vow of silence
    Carmelite, White Friar
    a Roman Catholic friar wearing the white cloak of the Carmelite order; mendicant preachers
    Black Friar, Blackfriar, Dominican, friar preacher
    a Roman Catholic friar wearing the black mantle of the Dominican order
    Franciscan, Grey Friar
    a Roman Catholic friar wearing the grey habit of the Franciscan order
    a Roman Catholic friar or monk belonging to one of the Augustinian monastic orders
    type of:
    religious person
    a person who manifests devotion to a deity
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