Posts and reviews would be focusing on Islam in some way: for example, you could ...
... review a book about Islam, or even a novel about someone who is Muslim or a memoir where Islam has affected someone even if they aren't self-identified as Muslim (for example, Azar Nafisi's "Reading Lolita in Tehran" would be okay).
... write about the portrayal of Islam or Muslims in books
... highlight a Muslim writer and their books
... something else you think of that fits the theme!