I had to Google the Athanasian creed... I dont know if I agree with it or not. Like I said earlier, the godhead is hard to understand.
K....,
It can be a challenge. See if this helps;
G-d always has been/ Christ has not
G-d created all/Christ did not
Christ was born of a virgin birth/ G-d was not.
Christ laid down His life on the cross/G-d did not.
Christ arose from the dead/ G-d did not.
Christ ascended into Heaven/G-d did not.
Christ sent us The Comforter ( The Holy Spirit) G-d did not.
Christ will return and His 2nd advent/ G-d will not.
G-d knows the day and hour of Christs' 2nd advent/ Christ does not.
There can be several more items listed..but, one gets the message.
The Trinity is alive and well.