Agreed.

The word "religion" comes from two Latin words: "res" + "ligare". "res" is loosely "thing" or can be used to refer to a concept (ie, "republic" - "res" + "pubblica" ['thing/item/abstract concept' of the people] and "ligare" is a 1st declension (if I recall correctly) verb meaning "to bind".

To be religious - fundamentally speaking - is simply to follow a set of rules or an ideology; to be bound to something.

Here is the typo to which I believe he is referring:

"but hese terms are ambiguous and hard to interpret"

It happens to everyone...