As a Druid of perhaps Old School, I normally use the term "Heathen" and "Pagan" interchangeably as they were in pre Twentieth Century press.
See my blog "What we so soon forget under the Druid's Tree" for a reference.
http://hoodoo-vodou-druido-grove.blogspot.com/2014/08/what-we-so-soon-forget-under-druids-tree.html
Yet Neo-Heathenism has aquire a new well accepted meaning. That of pertaining to old Germanic, Nordic and Viking religions that have be reborn as Asatru , Odlinism and others.
So here in "A Druid in Midgard" I to will use it in its newer social context.
TDK / The Druid King
This is also a good read!
Call us Heathens! by Arlea Anschütz and Steven Hunt
http://web.archive.org/web/20020611055346/http://www.anglo-saxon.demon.co.uk/Skvala/Heathen.html
Our Nemetonic Facebook Group space.
https://www.facebook.com/groups/DruidinMidgard/