Sibbel exhibited his Catholic faith proudly in all his work. The fine details of his statues and groups show evidence of his knowledge of the stories of the saints and the doctrine of the Roman Catholic Church. From one of his studio brochures, in his own words, Sibbel describes his goal:
"From the very beginning of my career as ecclesiastical sculptor it has been my constant and untiring ambition to combat the convenient manner of representing statuary so prevalent at the present day, and so destructive of true art, and to follow the great masters of the Renaissance in creating originality of design based on and consistent of the Renaissance tradition and study from life models. To be effective, ecclesiastical art must be practiced in a conscientious manner. It must inspire devotion, preach, stimulate religious sentiment, edify."