لما أن ذلك أشهر مباحثه وأشرف مقاصده
This is because questions of divine unity and attributes are among its most prominent topics and highest aims.
A discipline may be named for its principal concerns even while it embraces related questions. Thus the study of divine unity and attributes can also address prophethood, the hereafter and the reasoning needed to explain sound belief.
The description of the field's elevated aim refers to the importance of its object; it does not render practical obligations insignificant. Sound belief and correct conduct remain mutually related demands of religion.