As I understand it, we're in the context of a group pushing books endorsing Christian Nationalism. They're Fascists. They're Not Christians; the religion does not endorse their stances or actions. The symbols stand for things not substitutable for the other; presumbly, these concepts are opposed.
Now, is the statement "true"? Technically, no, a person could just be fatally deluded. But this is Propaganda: it is Art and therefore it can be anything I want people to appreciate, and I made it for those who appreciate it. May everybody nirvana and happy happy joy joy. May it kick ass on some coordinate on the Astral Plane.