5. What are Fides qua and Fides quae?
Already answered here.
Fides qua is the personal adherence; the belief that you have; the fact that you cling to Him. Fides quae is the assent to the whole Truth which God has revealed — it is the “stuff” of faith; the content of your faith; “what” you believe. The Creed symbolizes the fides quae.