Aranism was a herisy from the time of Constantine ((400AD era, from Alexandria)) saying that only the Father was God and not Jesus and the holy Spirit who proceed from God... minute 18 if you dont like all about the fuss, like Lewis ! 
the final split was in the 11th century, Rome insisting that The Father and Jesus are God, but maybe not the Holy Spirit...
They should have asked a Baptist
but they both / all were having all to much fun hunting down Baptists and killing them to listen to sound doctrine...
anyway,

the final split was in the 11th century, Rome insisting that The Father and Jesus are God, but maybe not the Holy Spirit...
They should have asked a Baptist

anyway,