Regarding: "So "I believe" is the proper rendering."
- Our current English translation of the 3rd typical edition of the missal from Rome approved by John Paul II uses the latin version of the Nicene-Constantinopolitan which begins with 'I'.
- The 2nd typical edition, the Paul vi edition (1975) translated the creed with "we".  The Nicene-Constantinopolitan creed in Greek begins with 'we'.