Is Trump cashing in? The book publisher says no. This is on their web site:
According to the book’s official site, the God Bless the USA Bible has nothing to do with Trump’s campaign. It is “not owned, managed, or controlled by Donald J. Trump, The Trump Organization, CIC Ventures LLC, or any of their respective principals or affiliates.” Instead, Trump’s “name, likeness, and image” are being used “under paid license from CIC Ventures LLC.”
OK, so Trump isn't profiting, something called CIC Ventures LLC is profiting. What is that? According to the Washington Post, it is just a pipeline to Trump.
In [Trump’s] financial disclosure released last year, he’s identified as the [CIC Ventures LLC’s] “manager, president, secretary and treasurer” and the Donald J. Trump Revocable Trust is identified as a 100 percent owner of the business. The same entity also receives royalties from his book “A MAGA Journey” and speaking engagements.
And...
According to the company’s documents, you’ll find the principal address for CIC Ventures LLC is 3505 Summit Boulevard, West Palm Beach, Florida. That is a Trump golf course. Moreover, in a 2022 disclosure, Nick Luna is listed as a manager. Luna was Trump’s personal assistant and body man.
So yes, Trump gets a cut of every Bible sold, even though the publisher tried to obscure that fact. How much of a cut though is anyone's guess. Apparently that hasn't been disclosed.