Surat Al Baqarah (119-120)

{ إِنَّا أَرْسَلْنَاكَ بِالْحَقِّ بَشِيراً وَنَذِيراً وَلاَ تُسْأَلُ عَنْ أَصْحَابِ الْجَحِيمِ } [البقرة:  119]

119- O honorable Prophet, we have sent you with the truth and sent to you the Qur'an therewith. So, your mission is to spread the religion, render trusts back, give glad tidings to the believers, and warn the disobedient ones with Hell; you shall not be asked why the disbelievers have rejected your religion. Certainly, they will be fully responsible for their own disbelief.

{ وَلَن تَرْضَى عَنكَ الْيَهُودُ وَلاَ النَّصَارَى حَتَّى تَتَّبِعَ مِلَّتَهُمْ قُلْ إِنَّ هُدَى اللّهِ هُوَ الْهُدَى وَلَئِنِ اتَّبَعْتَ أَهْوَاءهُم بَعْدَ الَّذِي جَاءكَ مِنَ الْعِلْمِ مَا لَكَ مِنَ اللّهِ مِن وَلِيٍّ وَلاَ نَصِيرٍ } [البقرة:  120]

120- The Jews and the Christians have never been pleased with you, O Prophet, even if you give them a proof after another or even if you treat them kindly. They do not need any proof to believe you, it is just their stubbornness and fanaticism. They will not be pleased with you until you embrace their religion, follow their sayings and whims and abandon the truth which you have been given. So, leave aside what pleases them and seek the pleasure of Allah by calling them to the truth. Verily, the true religion is that which Allah has sent down to you, whereas the other religions are not true. You should not replace the true religion with anything, whether small or big; everyone has a free will to believe or not. If you had followed their false opinions, corrupt sayings, and their twisted ways after Allah had sent down the revelation to you and after you had known that your religion is the true one, you had turned away from the guidance and Allah will not be your Guardian, Helper, Supporter and shall not push away the punishment from you.

This is an exhortation to the Prophet (peace be upon him) to be firm. One cannot imagine that the Prophet (peace be upon him) would have followed their religion but it is a warning to his nation to beware of the People of the Scriptures. They do not care for having dialogues and they only care for making you embrace their religion.