Polytheistic reconstructionism
Polytheistic reconstructionism (or simply reconstructionism) is an approach to modern paganism first emerging in the late 1960s to early 1970s, which gathered momentum starting in the 1990s. Reconstructionism attempts to re-establish genuine polytheistic religions in the modern world through a rediscovery of the rituals, practices and contextual worldviews of pre-Christian pagan religions.
Source: Wikipedia — Polytheistic reconstructionism (CC BY-SA 4.0)