Janus-faced a. : Double-faced; deceitful.

Example:
Do you flock behind enraptured pastors, obeying a Janus-faced god, by turns loving and damning...?

Taxonomy
Janus, god, temple of Janus, Janus Bifrons, deities, Ianus, myths, Arch of Janus, free encyclopedia, gates, origin, The doors, Athena, Macrobius, Roman mythology, beginnings and endings, one of the few, Uanna.

Defination from the web:
Janus (or Ianus) was the god of gates, doors, doorways, beginnings and endings. ... The Sculpture Gold coin, depicting Janus ... Numa in his regulation of the Roman calendar called the first month Januarius after Janus, at the time the highest divinity. ...