There is no opposite of the Bible, which is the literal meaning of Holy Writ.
However, in its broader meaning of any authoritative document, I'd say a tabloid newspaper would be an opposite.
http://www.answers.com/topic/holy-writ
What is the opposite of "Holy Writ?"
2 answers
It could be that any secular publication might be considered the opposite.
I hope this helps a little more. Thanks for asking.
I hope this helps a little more. Thanks for asking.