Full Idea
The notion that religions are creeds - lists of propositions or doctrines that everyone must accept or reject - emerged only with Christianity.
Gist of Idea
Christians introduced the idea that a religion needs a creed
Source
John Gray (Seven Types of Atheism [2018], Intro)
Book Reference
Gray,John: 'Seven Types of Atheism' [Penguin 2019], p.5
A Reaction
With a creed comes the possibility of heresy. I''m not happy with children being taught to recite something which begins 'I believe…', but which they have never thought about and barely understand.