Etruscan religion was very particular, and through researching it I've come to find it rather fascinating and unique. We are very limited in that many narrative sources for Etruscan religion are a) written by Romans, b) written after their conquest by the Romans, c) written relatively late. The way you write about a vanquished enemy who exercises a powerful pull on the imagination, it tends to skew towards the hyper-distinguishing features and that which figures best into your view of their culture. But between these bits and pieces and archaeology we can at least say something.
The Etruscans definitely believed strongly in fate, and boundaries. The city states had marked boundaries, maintained by public officials, the cities had marked boundaries, the traditional peoples of those cities had marked boundaries. These are all marked with tular stones, interference with these was a grave offence against the Gods. The sky had boundaries, each district of that sky having a different god watching over it, lightning/weather/bird flights in those districts having different meanings to one another. They made sophisticated models to keep track of this, along with models of organs used for omen-reading that corresponded with the aforementioned sky divisions. Architecture in their cities was rebuilt in the 6th and early 5th century BCE to suit their newer understanding of these sacred matters, aided by instruments like the precursor to the Roman groma. They freely mixed their own traditional Gods with Hellenic ones, but their versions of the Hellenic gods are very much their own. It's these versions of the Hellenic deities that then influence very early Roman religion. They adored Greek myths, and definitely understood them given their own domestic representations of key events from them, but the significance they drew from these stories was again very much their own.
An ATL where Etruscans get to respond to the formal Greek philosophical schools, or indeed late Hellenic religion, would make for an interesting timeline.