The Ibo people are polytheistic (worshiping many gods) usually in the form of wood or stone.
Some of these gods are:

AFRICAN ART:WOODEN FIGURINE. - Azande, Congo.Chukwu is the "supreme" god worshiped by the Ibo people. He is said to have appointed many smaller gods to help him because his work is too great for just one person. The Ibo people must fear Chukwu (for his will is too great to be known).(chapter 21)

Agbala is a god that can tell the future and speak to the spirits of departed fathers from his cave in the Ibo village.  Many people come from near and far to hear what Agbala has to say. Agbala appoints a priestess in the village to interpret and share his word with the fellow Ibo people. The people look up to her and refer to her as "god-like". The people of the village also listen to every word of the priestess, even if that means making a sacrifice.(chapter 3)
Ani is the goddess of the earth and harvest. Many people in the Ibo village sacrifice animals to Ani to entice a good harvest for the year. She is called upon many times during the year to bless crops (i.e. the Feast of the New Yam). It is also said that it is a crime against the earth goddess (Ani) to kill a fellow clansman.(chapter 13)
 Kikuyu Village
The Ibo people also believe that "chi" is also closely related to their religion. Chi is said to be an individual's personal god, which is determined by the individual's good fortune or lack thereof. The Ibo people hold their chi responsible for the events that occur in their lives. Because of this it is said that if you have "bad chi" then evil fortune will surely follow you to the grave.(chapter 3)
Religion in the Ibo village has been passed down from generation to generation, which is probably why they are so steadfast in their beliefs. For example, when white settlers came to the Ibo village the majority of the Ibo people were not willing to change their religion to Christianity, although there were a number of efulefus (worthless men) and osus (outcasts) to convert to Christianity. Religion is one thing that helps unify the Ibo village by sticking to their traditional values and strengthening their ancestral ties.

Religion is probably one of the biggest aspects of Ibo culture. It has major influences over Ibo government, farming, and even their superstitions.