Doesn't it make sense that the Christians of the 100 AD time frame were merely following what they had been taught by Paul and the rest of the Apostles?
Some did and some did not.
Where is the outcry from all of those "real" Christians who said "hey, those Catholics got it all wrong"
Historical fallacy, Roman Catholicism does NOT follow what the first and second century Church taught and practiced. Most of Roman Catholicism developed after the 6th century.
Where are the "reformed" Christians???
We've been here all along, as The Church.
Perhaps you are not familiar with the Church Fathers, who write about the Real Presence of the Eucharist, the Sacrifice of the Mass, the veneration and prayers for intercessions from saints and Mary, the belief that Baptism saves and can be administered to infants, and other such things. Your "6th century development" is not backed up by what information we have available.
We've been here all along, as The Church.
Where are the distinctive "Protestant" theological constructs, such as Sola Scriptura or Sola Fide? Where are the "Protestant" communities? Which orthodox Christian wrote about that before the first millenium expired? To explore history is to find out that Protestantism is a late invention of men.
Regards