Day and Night - Fundamental Mythologies
Syncretism is a term sometimes used to define the fusion of all religions, both ancient and modern.
Old Testament, Canaanite, Sumerian, Egyptian, and Persian religions are regarded as the sources of the Israelite religion, the latter having evolved from Animism and Fetishism into Henotheism and Monotheism.
Christianity originated from a continuation of these ideas and the influx of Brahmanistic, Buddhist, Graeco-Roman and Egyptian religious notions and from Stoic and Philonic philosophy.
It is believed to have been further explained and especially developed by Neo-Platonic Philosophy which was the catalyst for all modern developments in Philosophy and Ideology since the Renaissance.
Many religious ideas are common to all mankind, underlining the fact that all humans are members of the one species - the one universal global family.