Geez, so don't buy the damn book.
Is this really a hill anyone wants to die on, other than a left-wing environmental group?
From your link:
Among other moves, for example, NPS has allowed the placing of bronze plaques bearing Psalm verses at Grand Canyon overlooks.
The article implies that the plaques with Bible verses are an innovation of the Bush administration. The Psalms plaques were put up 33 years ago.
The National Park Service supervises and financially supports a number of religious sites, including churches on park land and many American Indian sacred sites.