Why are they called Flappers?

The term flappers originated in Great Britain, where there was a short fad among young women to wear rubber ( an overshoe worn in the rain or snow ) left open to flap when they walked. The name stuck, and throughout the United States and Europe flapper was the name given to liberated young women.

both believe in many god or polytheism

both built temples that they worshiped in both civilization's god were humanoid

both groups made religion a large portion of their lives

both believe in one religion throughout

the dead were buried with items for the afterlife