Zardnaar
Legend
Which "extinct" pantheons?
In Scandinavia, Norse, Sámi, and Finnish traditions are culturally sacred. Additionally, there are groups that adhere to them as religious worldviews. Norse folkbelief tends to be fun, but accurate representation and cultural sensibility are important.
In Egypt, Egyptian pantheon and Ancient Egypt generally are culturally sacred.
Greek too is culturally sacred, albeit the Greek Hellenistic ideal tends to welcome other cultures to borrow freely. Meanwhile there are groups today who adhere to Greek polytheism as religious worldview (mainly Neopagan).
Since the Renaissance, Paneuropean literature tends to embrace Roman polytheism as symbolic literary motifs.
Those pantheons died long ago.
Modern recreations are exactly that. I'm using the Greek one atm it's opt in.
Greek one lingered until 9th or 10th century, Egyptian 6th maybe 7th, Norse varies.