 if the people of the book argue against you say i and those who follow me have submitted ourselves to god. ask the people of the book and the illiterate ones have you embraced islam? if they embrace islam they will find guidance but if they turn away your task is just to preach. god knows all about his servants.
فإن حاجوك فقل أسلمت وجهي لله ومن اتبعن وقل للذين أوتوا الكتاب والأميين أأسلمتم فإن أسلموا فقد اهتدوا وإن تولوا فإنما عليك البلاغ والله بصير بالعباد