While my wife left school at 15 to begin work, she is as well read as I am. Probably like me, she has read at least a million words per week, from books magazines etc. for fifty years. Her vocabulary is as extensive (ie we know most of the words in the oxford dictionary for example) as mine, and her knolwedge of things is as good as mine inmany areas.
It is not one or the other you realise It only takes her about 15 minutes perday to read enough of the bible to complete it in a year and another 15 minutes or so to study what she has read, cross reference it and gain an understanding of any bits she doesn't understandread
Also, anyone who has NOT read the bible has not read the greatest example of human literature (By most measurements) It includes all forms of english writing, and devices, and in general its grammar syntax, construction, etc is far superior to most books.
We have both read all the "major great works of mankind" in english, from literature like cervantes, the brontes, swift, dumas melville, carrol, trollope, dickens, wordsworth, elliot, james, twain, dostoevsky, keats, tolstoy stevenson wilde jack london and "modern" writers; such as conrad, buchan,joyce, woolfe, forster, lawrence, fitzgerald kafka and hemingway; histories such as "the decline and fall of the roman empire" for example, plus a lot of other historical and autobiographical material.
We had a personal library of over 10000 books including some over 200 years old it would be difficult for you to name a writer writing in english which we ahve not read. We have both also read thousands of really modern novels and other literature. I have read 10 this week including 3 last week end.