Who do you think created this holiday? Humans did in honor of St. Patrick. St. Patrick’s day is a cultural and religious celebration held on 17 March, the traditional death date of Saint Patrick the foremost patron saint of Ireland. Saint Patrick’s Day was made an official Christian feast day in the early 17th century and is observed by the Catholic Church, the Anglican Communion, the Eastern Orthodox Church, and the Lutheran Church. Celebrations generally involve public parades and festivals, cèilidhs, and the wearing of green attire or shamrocks. St. Patrick day is overall a very fun holiday unless you get pinched.
Click here to see where I got the information from this post.