Upon delving into the Lexham Survey of Theology, I quickly noticed a couple things that, together, I had not expected, and which I consider worthy of note:
1. The Lexham Survey of Theology is unambiguously Protestant in its perspective.
2. The Lexham Survey of Theology does not indicate that it is Protestant in its perspective.
Rather, this book seems to be trying to pass itself off as an "objective, sympathetic, [and] reverent" text "written from a scholarly perspective," to quote from the description given in the Library info pane. It's not at least one of those things. It is not objective. It is unambiguously Protestant. That's OK. But please say so.
(In case you're wondering, I looked at the articles on the sacraments first.)