What is the ruling on praying behind someone who regularly recites Al-Burda without believing in the content of its blasphemous verses, such as: "O most noble of creation, I have no one to seek refuge with but you when the overwhelming calamity befalls; if you do not take me by the hand out of grace on my Day of Return, then say, 'O what a stumble!' For indeed, from your generosity are this world and the hereafter, and from your knowledge is the knowledge of the Preserved Tablet and the Pen"?