As we enter the slippery terrain of the world of religion, it is necessary to add the disclaimer that archaeology is limited in its ability to shed light on belief systems. If the religiousness of a human group expresses the vital necessity to establish balance with an often-hostile world, while at the same time providing a collective and cohesive answer to death, it's in these two areas where we should look for the answers the Vaccean people created.
Our information regarding the first area, from written sources, are few in number. We do not have, for example, cultural descriptions like those about the Gauls written by Caesar. The Roman historians largely focused on the wars between Vacceans and Rome.
However, the idea of a Celtic religion with universalist tendencies, in which a globalized and non-idea, centering on the gods Lug and Dis Pater, seems clear. In the Celtic mentality, the night becomes day in the same way that a being is born from a non-being. It is understood that the Celts counted by nights, setting the beginning of the year on the night of November 1st, the Samain festival, during which the great beyond was contacted and which has similarities to the Christian All-Saint's Day and Halloween. Another long-lasting, documented festival in the Celtic calendar is Lughnasadh, or the Assembly of Lug, which was an agrarian holiday, celebrated in August at the end of the harvests where the many-faceted god Dis Pater shows off his positive side.
Because the Vaccean used few figurative concepts for their representations, mainly geometric patterns like concentric circles, rhombi, waves, etc., it should be noted that they created some enigmatic representations of animals as seen from above, some which have been identified as wolves. They likely allude to a type of mythological story that we have no other information about, bearing in mind that the Vacceans were practically illiterate.