Answer

1. Call to the way of your Lord with wisdom and fair admonition, and argue with them in the kindest way. Your Lord knows best who is misguided from His way. And He knows best who are guided. (16:125)
2. Only argue with the People of the Book in the kindest way–except in the case of those of them who do wrong–saying, ‘We believe in what has been sent down to us and what was sent down to you. Our God and your God are one and we submit to Him.’ (29:46)