For some readers, these ideas may be perceived as disrespectful or offensive to their religious beliefs. The book challenges certain long-held doctrines and traditions, which can be perceived as sacrilege. However, it's important to note that the novel is a work of fiction and should not be taken as historical or religious fact.
Ultimately, the question of whether The da Vinci Code is sacrilegious is subjective and depends on the individual's perspective and religious beliefs.