if they argue with you say i have submitted my face to allah and so have those who follow me to those who have received the book and to the ignorant ask have you submitted yourselves to allah if they became muslims they were guided if they turn away then your only duty is to warn them. allah is watching over all his worshipers.
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