What we learn from the 20th century is that not all forms of trinitarian theology are orthodox. It is very possible to be a non-Nicene Trinitarian. So, what does it mean to confess the Nicene doctrine of the Trinity today?
(1)God is 3 persons.
(2)Each person is fully God.
(3)There is one God.
“(T1) There is exactly one God;
(T2) there are exactly 3 coeternal persons “in” God: the Father, the Son, & the HS;
(T3) the F, the S, & the HS are not identical;
(T4) the F, the S, & the HS are consubstantial.”