200 AD Immersion of infants who are dying, but considered sinless.(Tertullian V.12)
250 AD North Africa region is first to practice infant baptism and reduced the age of baptism from minors to all newborns. This is opposed by other regions.
257 AD Baptism by sprinkling for adults instead of immersion first used as an exception for those on sick beds, but it caused great dispute.
300 AD Prayers for the dead
320 AD Special dress code of the clergy in worship
325 AD At the general council of Nice,
325 AD It was proposed indeed, probably by the Western bishop Hosius, to forbid entirely the marriage of priests; but the motion met with strong opposition, and was rejected.
325 AD The date for Easter was set.
379 AD Praying to Mary & Saints.(prayers of Ephraim Syrus)
385 AD In the West, the first prohibition of clerical marriage, which laid claim to universal ecclesiastical authority, proceeded in 385 from the Roman church in the form of a decretal letter of the bishop Siricius to Himerius, bishop of Tarragona in Spain.
389 AD Mariolatry begins with Gregory Nazianzen, who mentions in a eulogy, how Justina had besought the virgin Mary to protect her virginity.
400 AD Impossibility of apostasy or once saved always saved,(Augustine XII.9)
416 AD Infant baptism by immersion commanded of all infants (Council Of Mela, Austin was the principal director)
430 AD Exhalation of Virgin Mary: "Mother of God" first applied by the Council of Ephesus
502 AD Special dress code of the Clergy all the time.
500 AD The "Habit" of Nuns (Black gowns with white tunics)
519 AD Lent
526 AD Extreme Unction
593 AD The Doctrine of Purgatory popularized from the Apocrypha by Gregory the Great
600 AD First use of Latin in worship (Gregory I) Beginning of the Orthodox/Roman Catholic church as we know it today in its present organization.
607 AD First Pope: Boniface III is the first person to take the title of "universal Bishop" by decree of Emperor Phocas.
608 AD Pope Boniface IV turns the Pantheon in Rome into a temple of Mary ad martyres: the pagan Olympus into a Christian heaven of gods.
670 AD Instrumental music: first organ by Pope Vitalian
709 AD Kissing of Pope Constantine’s feet
753 AD Baptism by sprinkling for those on sick beds officially accepted.
787 AD Worship of icons and statue approved (2nd council of Nicea)
787 AD Rome (Latin) and Constantinople (Greek) part ways and begin the drift towards complete split, resulting in two denominations emerging in 1054 AD.
965 AD Baptism of bells instituted by Pope John XIII
850 AD Burning of Holy Candles
995 AD Canonization of dead saints, first by Pope John XV
998 AD Good Friday: fish only and the eating-red meat forbidden
1009 AD Holy water
1022 AD Penance
1054 AD Roman Catholic Church breaks away from the Orthodox Church
1054 AD Roman Catholics officially embrace instrumental music, Orthodox reject instrumental music down to the present time.
1079 AD Celibacy enforced for priests, bishops, presbyters (Pope Gregory VII)
1090 AD Rosary beads: invented by Peter the Hermit
1095 AD Instrumental music
1190 AD Sale of Indulgences or "tickets to sin" (punishment of sin removed)
1215 AD Transubstantiation by Pope Innocent III, Fourth Lateran Council
1215 AD Auricular Confession of sins to priests instituted by Pope Innocent III,(Lateran Council)
1215 AD Mass a Sacrifice of Christ
1217 AD Adoration and Elevation of Host: ie. Communion bread (Pope Honorius III)
1230 AD Ringing bells at Mass
1251 AD The Scapular, the brown cloak worn by monks invented by Simon Stock
1268 AD Priestly power of absolution
1311 AD Baptism by sprinkling accepted as the universal standard instead of immersion for all, not just the sick.(Council of Ravenna)
1414 AD Laity no longer offered Lord's cup at communion (Council of Constance)
1439 AD Purgatory a dogma by the Council of Florence (see 593 AD)
Now, remind me of what the term "apostolic" means.