Thank you for your reply! Current document protections:

Forms are set to Read-Only so that they can be filled out and printed or saved as a unique record. They're a combination of instructional paragraphs and tables holding content controls. Users can't accidentally add text to the instructional paragraphs via grouping the entire document (i.e. ctrl+A > group).

My predecessor did not use forms, just blank spaces in tables, so some of our forms cannot use filling in forms as an editing restriction. When I began updating, I looked into using Restricting Editing, and at some point discovered certain functions that I wanted did not work while it was active (I'd honestly have to go back, I can't remember specifically why). Grouping has worked well up until this point.

I tried Restricting Editing to Filling in Forms and the same VBA error comes up in attempting to execute the range.delete, as though maybe "Filling in Forms" is an existing macro to group the entire document.

What did you mean by rad-only protection? I'm not familiar with that term.