I agree. ‘Heilig’ can be used outside of a religious context to mean e.g. something which is so serious or important that it inspires awe or a heart-felt wish to protect it.
Der Name Beethoven ist heilig in der Kunst.
Kein Bike ist heilig – Kaichiro Kurosu macht aus Serienmotorrädern unverwechselbare Einzelstücke.
Qualität ist uns heilig.
Jedes Menschenleben soll heilig sein.
Food for thought: http://english.stackexchange.com/questions/84837/whats-the-difference-between-hallow-sacred-holy-and-saint That "holy" and "sacred" are synonyms from difference sources (Germanic and Romance, respectively) is clear: what is less clear is whether they are pretty much interchangeable, or whether there is a subtle difference in meaning.
Or even a reference to earth-based spiritualities, like Druidism or Wicca.
Animism is the belief that everything is alive; all beings in the cosmos – rocks, animals, trees, stars, water, humans, insects, fire – have spiritual essence. The large spirits [of a mountain, a large river, the whole planet…] may be termed gods, but are actually only large and powerful spirits.
Pantheism is the belief that there is one supreme being/force who/which permeates all substance and all life; everything contains a spark of divinity, and everything is one; it locates God/ess strictly in the creation, in the immanent: "The tree is God. God is the tree; it experiences the cosmos as divine; divinity is immanent and non-personal.