Holbein's The Ambassadors has several references to religious content. True or False

It is true that Holbein's The Ambassadors has several references to religious content.

Although pretty symbolic and hidden, those references can indeed be found in the painting. For example, if you take a look at the top left corner of the painting, you will barely see a crucifix slightly showing behind the green curtain. Additionally, the book on the table is a Lutheran hymnal, so it's a book of hymns sang in a church.

It is actually true surprising is it not