He did not really illumine or convert great Armenia, for the people were in the main already converted by Syrian missionaries to the Adoptionist or Ebionite type of faith which was dominant in the far East, and was afterwards known as Nestorianism.
Symmachus, according to Eusebius and Jerome, was an Ebionite; Epiphanius represents him (very improbably) as a Samaritan who became a Jewish proselyte.
Outside this group would come what are called the Apocryphal Gospels and Acts (Gospel according to Hebrews, according to Egyptians, of Peter, of Truth, of the Twelve [or Ebionite Gospel], the recently recovered so-called Logia; the Gospel of Nicodemus, the Protevangelium of James, the Gospel of Thomas, the Acts of Pilate, Acts of Paul, Peter, John, Andrew, Thomas; the Preaching of Peter, the Apocalypse of Peter).
Even the so-called Judaeo-Christian Gnostics (Cerinthus), the Ebionite (Essenian) sect of the PseudoClementine writings (the Elkesaites), take up an inconsistent attitude towards Jewish antiquity and the Old Testament.
However, we do hear of versions of Nestorian writers like Diodore of Tarsus being in circulation, and the Disputation of Archelaus proves that the current orthodoxy of eastern Armenia was Adoptianist, if not Ebionite in tone.