It should be noted that Clarke included a disclaimer at the start of the book, apparently not wanting to be confused with L. Ron Hubbard, that this was a religious novel.
The book is anti-religious, in that the aliens are able to show the actual historical origins of the world’s religions are fake, with a very few exceptions.
I remember that part of the book.
Uhhh, actually they blocked time viewer access to all areas and times associated with any extant religion’s origin.
Quite the opposite of proving them false.