Why do the saints use the fleur de lis as their symbol?

Answer 1

For one, New Orleans is a city of many different cultures and heritages with one of the most prominent ones being the french culture and heritage. The Fleur-De-Lis is of french origin meaning "Lily Flower" in English so naturally, that is one reason for the usage. Another reason is that their names are the "Saints" and the Fleur-De-Lis is used by many as a religious smybol. It sometimes represents The Holy Trinity and sometimes is associated with The Virgin Mary, so again, naturally it seemed to only make sense to use the Fleur-De-Lis as the logo.

Answer 2

Because of its french and religious background. New Orleans has a french and religious background and the religious part goes well with a team called the Saints.