You are assuming that the church and its hierarchy were illiterate and that is simply not true.
history shows that these were the men doing the writing of the earliest documents and letters to the various churches.
The didache didnt drop out of the sky one day and give instructions for worship.
They were educated and could read and write.
You mentioned how you dont understand the lack of mention of the holy spirit, again, that is incorrect. The teaching position of the pope is based on infallible teaching guided by the holy spirit.
You cant assume the church leaders were some sort of stumbling boobs who couldnt lace their own sandals...
look at all the rich, scriptural filled writing of the folks like clement, and others...living at the time of the apostles and teaching in their name as their succesors...
You mean the guys(apostles) that argued among themselves (in Jesus presence) who would be greatest in heaven?.. Those guys?..
Obviously they missed much of what Jesus taught.. Jesus must have been rolling his eyes over that event.. You know when he grabed a little child and said, UNLESS they become as one of THESE they would never even SEE heaven..