Our only commission is to preach the Gospel to the heathen. Conversion is left in the hands of Jesus. If the Word has been given, the rest is up the heathen and God, our job is done.
The question is HOW you preach it. Paul preached Christ one way to the Jews and to the Greek believers, another way to the pagans, and let us not forget S. Paul’s address to the philosophers in Athens. In Acts 17:32-33, we read that some mocked, others said, we must hear more about this[later] But there were men who attached themselves to him and learned to believe. among them Dionysius the Areopagite; and so did a woman named Damaris, and others with them.
But this pope never engages in dialogue without dealing with differences. In this case, the difference must be Christ, whom the Muslims reject.