Which aspects of today’s halloween practices are christian in origin and which are pagan?

Halloween practices have christian origin and pagan, both are interrelated and became what we celebrate today on October 31.

Explanation:

This date falls on the last day of October because it is the eve of the Catholic Feast of All Saints.  

With the arrival of the plague the French began to worry not only for the living but for also for the lost souls. They disguised themselves on the Day of all souls and then this tradition was mixed when the Irish and the French began to marry each other.

Every year, October 31 becomes the most terrifying night of the year, which gives way to All Saints' Day, when deceased relatives are remembered. This day is the Christianization of a much older pagan festival, held in the Middle Ages with the intention of including the people.

One of the ritual that is preserved is the current trick or treat, based on the ambassadors of death, which consisted of people who went house to house asking for food offerings to offer the spirits and keep them happy.

Also, the rite of luminous pumpkins has its antecedent in the Celtic tradition of carving turnips and other vegetables to illuminate them and ward off evil spirits to live quietly tonight.