The Etruscans believed that everyone was controlled by deities and that lives were led by the belief in predestination and the whims of the gods. They had deep rooted superstitions and rituals that were highly regarded even by the Romans. There were extensive religious books that have been since destroyed.
Religion in Etruria required a long and laborious study. The Etruscans developed high-class learning facilities for priests. These facilities not only taught religious law but also secular scientific law. The two were inseparable in the Etruscan culture. What ever the gods did must be in harmony with nature.
The Etruscans created a religious book containing all knowledge and rules concerning their belief system. It was called the Disciplina Etrusca, and was composed of three parts, libri haruspicini, libri fulgurates, and the libri rituals.
Gods and Goddesses:
Many of the Etruscans gods are comparable to the well know Roman goads. For example, Ani, the Etruscans god of beginnings, is similar to Janus, the Roman god of beginnings. Also Nathuns, the Etruscan god of water and moisture is the equivalent of Neptune, the roman god of the same thing. List of Gods and Goddesses.