Credo in unum Deum,
factórem cæli et terræ,
visibílium ómnium et invisibílium.
(I believe in one God,The key word, the initial word, is "credo", "I believe". "Credo" is related to the English word for "heart" (which is, in Latin, "cor" or "cordis"; in Greek, "kardia"; in Sanskrit, "hridaya"). To say "credo" in Latin is to say that you take something to Heart, not simply or primarily intellectually, but to the deepest part of one's being.
maker of sky and earth,
all things in-sight and out-of-sight.)
Likewise, the English word "believe" derives from an Indo-European root "leubh", meaning "to care, to desire, to love". The intellect is a useful tool, but it isn't the medium of true care, true love. "Belief", then, is not centered on rational agreement with certain conceptual arguments. Rather, belief is the heart-felt love-care of a person, whether human, animal, plant, otherwise-organic, or otherwise-inorganic. To believe in a creed is to care from the Heart for that which the creed symbolizes.