Syncretism is the practice of combining different beliefs and various schools of thought. Syncretism involves the merging or assimilation of several originally discrete traditions, especially in the theology and mythology of religion, thus asserting an underlying unity and allowing for an inclusive approach to other faiths. While syncretism in art and culture is sometimes likened to eclecticism, in the realm of religion, it specifically denotes a more integrated merging of beliefs into a unified system, distinct from eclecticism, which implies a selective adoption of elements from different traditions without necessarily blending them into a new, cohesive belief system. Syncretism also manifests in politics, known as syncretic politics.

Osiris is the god of fertility, agriculture, the afterlife, the dead, resurrection, life, and vegetation in ancient Egyptian religion. He was classically depicted as a green-skinned deity with a pharaoh's beard, partially mummy-wrapped at the legs, wearing a distinctive atef crown, and holding a symbolic crook and flail. He was one of the first to be associated with the mummy wrap. When his brother Set cut him up into pieces after killing him, Osiris' wife Isis found all the pieces and wrapped his body up, enabling him to return to life. Osiris was widely worshipped until the decline of ancient Egyptian religion during the rise of Christianity in the Roman Empire.