I don’t know of a good website, but I can suggest what I would do, as a complete amateur with an interest in Church history.
-The initial evangelization of Jews, and the acceptance by the other Apostles of Paul’s approach of evangelizing any and all.
-The eviction of Christian Jews from the temples
-The destruction of Jerusalem, which furthered the trend of Christianity emphasizing its distinctiveness from Judaism
-The early belief that the Second Coming would be within at most several decades
-The early spread of the Church by the Apostles and wandering prophets, then the Apostles’ successors who were bishops, and their assistants who were deacons. Later, the development of the office of the office (and order) of presbyter (priest).
-Martyrdom under periodic waves of persecution, maybe a few key examples like St. Ignatius
-Monasticism and the evangelization of Russia, northern Europe, etc
-The conversion of Constantine
-Now that Christianity was legal, the use of ecumenical councils to iron out differences
-Adoption of Apostles Creed and later the Nicene Creed
-The filioque and politics of the Roman and Byzantine Empire that led to schism between East and West
-Rise of Islam and the Crusades
-The Renaissance, Michelangelo, Galileo
-Protestant Reformation, and the Counter Reformation
-End of most religious wars in Europe with the Peace of Westphalia
-Papal States, unification of Italy, and Italy’s recognition of Vatican City as it is today
-Church in WWII
-Vatican II and aftermath
Then catch up on how some other points fit in if they weren’t included yet:
-Development of each of the 7 sacraments, maybe mention Aquinas etc
-Other churches in union with the Latin church
That’s 20 points, so you get 2.25 minutes for each.
I sure hope you are doing a power point or using some sort of visual aid, or eyes will glaze over in the first couple minutes. You will also probably find some of these points less important or less entertaining, so you’ll probably want to cut some of them. Also, know your audience - if this is a teenage group, they probably won’t be quite as knowledgable as an adult confirmation group, as the latter will include some who already were seeking out an understanding of the Church and its history.
