Religion

did the word "religion" appeared just after the Christian faith became the
official religion of Roman Empire or is this word mentioned some time
before?
I think at "re-ligion" as "re-bind" , thus to rebind to a new unity with the
divinity this is why I asked myself if the word as such spreaded from the
time the emperor (CG) decided the new religion is the religion of the Roman
Empire.

Alex