This thread is not meant to debate Christian doctrines. Rather, the WI is what would the global religious scene be, presuming Christianity can gain ascendance in Rome, that standard Theology stretching back to Tertuallian, Origen, and then headier theologians such as Athanasius, Chrysostom and Augustine were all Unitarians, and not Trinitarians?
Would Judaism become like Zoroastrianism (irrelevant and tinier) and essentially get absorbed into Christianity? Would Islam essentially be a different branch of Christianity? Would there be modern versions of Jehovah's Witnesses that are Trinitarian?
Lastly, what if older, better authenticated, manuscrips were unearthed beginning in the 19th century that showed that 1 John 5:7 had a Trinitarian statement? How would "Orthodox" Christians react?