Duality
A prominent theme in Inca mythology is the duality of the Cosmos. The realms were separated into the upper and lower realms, the Hanan Pacha and the Ukhu Pacha and Hurin Pacha. Hanan Pacha, the upper world, consisted of the deities of the sun, moon, stars, rainbow, and lightning while Ukhu Pacha and Hurin Pacha were the realms of Pachamama, the earth mother, and the ancestors and heroes of the Inca or other ayllus. Kay Pacha, the realm of the outer earth, where humans resided was viewed as an intermediary realm between Hanan Pacha and Ukhu Pacha. The realms were represented by the condor (upper world), puma (outer earth) and snake (inner earth).
Huacas (sacred sites or things), were widespread around the Inca Empire. Huacas were deific entities that resided in natural objects such as mountains, boulders, streams, battle fields, other meeting places, and any type of place that was connected with past Incan rulers. Huacas could also be inanimate objects such as pottery that were believed to be vessels carrying deities. Spiritual leaders in a community would use prayer and offerings to communicate with a huaca for advice or assistance. Human sacrifice was a part of Incan rituals in which they usually sacrificed a child or a slave. The Incan people thought it was an honor to die for an offering.
There is archaeological discoveries supporting the presence of sacrifice within Inca society according to Reinhard and Ceruti: "Archaeological evidence found on distant mountain summits has established that the burial of offerings was a common practice among the Incas and that human sacrifice took place at several of the sites. The excellent preservation of the bodies and other material in the cold and dry environment of the high Andes provides revealing details about the rituals that were performed at these ceremonial complexes."
Read more about this topic: Religion In The Inca Empire