He hath ordained unto you the religion which he commanded unto Noah, and which We have revealed unto thee, and which We commanded unto Abraham, Moses, and Jesus; saying, Maintain the (true) religion, and be not at variance therein.

سورة الشورى

وَمَا تَفَرَّقُوا إِلَّا مِن بَعْدِ مَا جَاءهُمُ الْعِلْمُ بَغْيًا بَيْنَهُمْ وَلَوْلَا كَلِمَةٌ سَبَقَتْ مِن رَّبِّكَ إِلَى أَجَلٍ مُّسَمًّى لَّقُضِيَ بَيْنَهُمْ وَإِنَّ الَّذِينَ أُورِثُوا الْكِتَابَ مِن بَعْدِهِمْ لَفِي شَكٍّ مِّنْهُ مُرِيبٍ
فَلِذَلِكَ فَادْعُ وَاسْتَقِمْ كَمَا أُمِرْتَ وَلَا تَتَّبِعْ أَهْوَاءهُمْ وَقُلْ آمَنتُ بِمَا أَنزَلَ اللَّهُ مِن كِتَابٍ وَأُمِرْتُ لِأَعْدِلَ بَيْنَكُمُ اللَّهُ رَبُّنَا وَرَبُّكُمْ لَنَا أَعْمَالُنَا وَلَكُمْ أَعْمَالُكُمْ لَا حُجَّةَ بَيْنَنَا وَبَيْنَكُمُ اللَّهُ يَجْمَعُ بَيْنَنَا وَإِلَيْهِ الْمَصِيرُ

And they did not differ until after the knowledge (of Divine Revelation) came unto them, rebelliously among themselves: and unless the word had gone forth from thy Lord ( respiting them) until a fixed time, verily the matter had been decided

between them. And verily they that have inherited the book after them are in a perplexing doubt respecting the same. 
Wherefore invite (men unto the true faith,) and stand fast as thou hast been commanded, and follow not their desires. And say, I believe in whatever books God hath revealed, and I am commanded to decide between you: God is our Lord, and your Lord. To us will (be reckoned) our works, —to you, yours. There is no ground of dispute between us and you. God will gather us together, and to Him shall be the return.