Try reading the Book of Mormon that will explain everything in total.
I tried reading the Book of Mormon, but I found it uninspiring.
Alterations on the Great Pyramid were supposedly made by a fellow 60 or more years ago whose book claimed that measurements and markings in the Great Pyramid were proof and prophesy of the history in the Bible made after the Pyramid was built: Great Pyramid Proof of God by George Riffert published in 1942.
My father bought and read this book to us about 60 years ago. Later Dad said he thought the fellow was a fraud, that he’d been caught making marks to fit with his theory. I have only my memory of this. Didn’t find anything in a quick Google search.