One idol, across the ages
The Dies & Rises
The god who passes through death and returns.
Why these are the same idol
The oldest stories are agricultural: the grain dies into the earth and returns in spring. Wrap that cycle in a person and you get the dying-and-rising god, the deity who descends into death and comes back.
Inanna strips through seven gates into the underworld and is hung as a corpse before her return. Osiris is murdered, dismembered, reassembled and enthroned as king of the dead. Christ is crucified, descends, and rises on the third day.
The details differ and the theologies fiercely deny the comparison, but the narrative skeleton is unmistakable: a descent, a death, an underworld, and a return that guarantees life for everyone else.