Sagot :
What is it that defines Christianity? the answer would be the definition of Christianity is given us in the creed.
The creed summarizes what we believe -> FAITH. Learning the creed doesn't only mean learning them by the head. It is the application to our daily life. We learn the creed not only because we are proud to profess our faith but to a greater meaning, being the exterior profession of Faith, it should reflect whats within.