The truth of the matter is that in the bygone era of state-sponsored religion, you have no idea how many of the lowly serfs knew and "believed" in the doctrinal points of the Creed.  And even if it was a proportionately high number, I stand by my statement that this bears no correlation with having a personal relationship with the risen Lord... which most modern theologians agree is the key to eternal salvation. 

Your use of the word "truths" with respect to the Creed reduces it's import to mere formula as opposed to its intended use as an article of FAITH... i.e., "I/We believe in one God..."  Do you see how that works?