100s - Gnosticism within the early Church
200s - "The Ghetto Church". Widespread abuse by clergy in the Empire. (See "Council of Elvira" in Spain)
300s -Arianism and the attack on the divinity of Christ
400s - East/West political divisions. Rome’s waning power and its inability to teach from its Chair.
500s - The failure to evangelize the Huns
600s - Widespread gang culture within the ex-Empire
700s - Conversion of Christians to Islam.
800s - Corruption within Charlemagne’s Empire
900s - Widespread failure for Christendom to coordinate against the triple pronged attacks from Normans, Muslims, and eastern invaders.
1000s - Schism East/West
1100s - The crumbling of ancient churches and widespread apathy
1200s - Failures to protect Christian pilgrimages
1300s - The Papacy relocated to Avignon. Foreign manipulation on the Chair.
1400s - The continued accumulation of material power by bishops. Clergy with mistresses, catamites, etc.
1500s - The Protestant Revolution and the religious wars
1600s - Abuses in the New World and abroad
1700s - Jansenism
1800s - Modernism
1900s - Apostasy of the West
2000s (today) - Catechesis and Duplicity
2100s - Misuses in genetic engineering & human DNA
2200s - Isolation within virtual reality. Access to the sacraments.
2300s - Tensions between Earth and colonies abroad. Difficulty for Rome to teach from its Chair
2400s - Super A.I. and philosophical debates around the purpose of humanity. What it means to be human and why it matters. What it means that Christ became human.
2500s - Widespread prosperity, wealth, and peace, both on Earth and abroad. Intense philosophical debates on the purpose of religion and spirituality. The ultimate question of why we need God in our lives.
I did this without the assistance of Google :), other than double checking the date for when Arius and Charlemagne were around.
Sex scandals are awful and damaging but I don’t know if I could pin that to a single century.