This is a sad question, because the answer is obvious. It has happened over a period of many decades, and while it occurred no one did anything to stop it. The same happened with some Presbyterians, Evangelical Lutherans, United Church of Christ. Methodists are int he midst oft he battle.
Make " It has happened over a period of many decades" a period of many centuries Zack.
One can start with the De Trinitate of Augustine of Hippo and one can trace the steps from there.
They become easier to trace the closer we get to the present. Remember Vatican II, the Spirit of Vatican II? We are not talking here about just what has been going on within mainline Protestantism, or even just within the West.
What gets really scary is leaving the West to see what's been going on in the East. Here again, Augustinian thought threatens to take control. We see it in Russia with the overthrow of the Czar and the Bolshevik Revolution, in Greece with the Freemasonry of EP Meletios Metaxakis and the changes he introduced.
"How did we get to a state in the Episcopal Church were orthodoxy as set forth in the Nicene Creed is out, and heresy is taught to our clergy by Marcus Borg at the request of the officials of this diocese?"
'This is a sad question, because the answer is obvious. It has happened over a period of many decades, and while it occurred no one did anything to stop it. The same happened with some Presbyterians, Evangelical Lutherans, United Church of Christ. Methodists are int he midst oft he battle.'
That is how it happened and in the last 1.5 to 2 decades.
To read later.