Well, I don't want to offend, but there is no threefold order of ministry -- bishop, priest, deacon -- in the first century churches. There were two orders or offices.
well, there are three. bishop, priest, and deacon are mentioned in Scripture. bishops and priests have the same qualifications because the bishop, first and foremost, is the priest. the elders were an extension of his ministry because he could not be at all of his parishes. the local Church is the diocese, not the individual parish. so again, the bishop is what he always was, the presiding and overseeing priest.
There is no "Mariology" in the first century churches.
yeah there are, it is just not clearly hashed out in Scripture because that was not the point of Scripture. however, there are early frescoes of her with her Son in the catacomb Church, and there is one from the 2nd century under St. Peter's in Rome. not to mention, when the Church came up from being underground, Marian devotions came with them. as soon as it was legal for Christians to worship, her veneration was clear. and this means that her devotions would have been prior to 313, and again, her in iconography is from the first centuries as well. we still have two icons by St Luke, and both of them being of Mary and Christ.
There is no infant baptism there.
yes it is, in the Bible when it says that whole households were baptized, it would have included children. to say that there is no infant baptism is to say that there is no Trinity.
There are no rules about ministers' marriage or remarriage, such as is found in the EOC.
nowhere does the Bible actually say that one can remarry and remain a priest. and again, there is no mention of the term Trinity until Tertullian. you are reading your opinion into places where it is merely silent.
Catholic and Orthodox ecclesiology is not found in the first century churches.
Orthodox ecclesiology is, our ecclesiology is still based on that first century model, where the bishop is the chief priest, who served with his elders, assisted by the deacons, all with and for the laity.