Within the spirit of the word "religion," any system of morality is an expression of religion because it is a way of life. Webster's Dictionary of the English Language defines religion as "a system of beliefs and practices relating to the sacred and uniting its adherents in a community." It is also "something which has a powerful hold on a person's way of thinking, interests, etc." Thus, religion does not need to be related to the divine, for Webster's proceeds to use the example, "Football is that man's religion." Devotion to anything creates a way of life.
Webster's New World Dictionary adds, "the state or way of life of a person in a monastery, convent, etc." Combined, these dictionaries show that "religion," while most frequently (and rightly) understood in relation to God and church, can also indicate a secular devotion to a body of beliefs, values, and laws that effectively motivate one to live his life in a certain way.
When applied to secular life, this has interesting ramifications. Any system of morality is an expression of religion because it concerns itself with values and the way we live. Law, therefore, is enacted, codified morality.
John W. Ritenbaugh
The First Commandment (1997)