Hence the greatest heresy is Arianism
Arianism
Arianism threatened to crush out orthodoxy -- that is a powerful heresy
I don’t know who drew that diagram, but neither Jesus Christ, nor the apostles, EVER used the phrase ‘God the Son’. They always used the phrase ‘Son of God’. Even Satan and his demons addressed Jesus Christ as the ‘Son of God’. Foretelling of the birth of the Christ child, the angel Gabriel used the phrase ‘Son of God’. And witnessing his death on the cross, the centurion said, “truly this man was the Son of God”.
The apostles knew that God the Father is omnipresent (there’s not a circle big enough to put him entirely in it). They knew that Jesus Christ dwells in the midst of (the invisible) God the Father, and that God the Father dwells IN Jesus Christ, and has given the Christ ALL power in heaven and earth. They knew that the Holy Ghost proceeds FROM God the Father. God gives of his Spirit as he sees fit for the task at hand; be it rebirth, healing, prophecy, etc.