Surah Al-Baqarah, verse 120

وَلَن تَرْضَىٰ عَنكَ ٱلْيَهُودُ وَلَا ٱلنَّصَـٰرَىٰ حَتَّىٰ تَتَّبِعَ مِلَّتَهُمْ ۗ قُلْ إِنَّ هُدَى ٱللَّهِ هُوَ ٱلْهُدَىٰ ۗ وَلَئِنِ ٱتَّبَعْتَ أَهْوَآءَهُم بَعْدَ ٱلَّذِى جَآءَكَ مِنَ ٱلْعِلْمِ ۙ مَا لَكَ مِنَ ٱللَّهِ مِن وَلِىٍّ وَلَا نَصِيرٍ ﴿١٢٠﴾

2:120 The Jews and the Christians will never be pleased with you until you follow their religion. Say, “The guidance of Allah is the [true] guidance.” If you were to follow their desires after the knowledge that has come to you, then you would have no protector or helper against Allah