فَإِنۡ ءَامَنُواْ بِمِثۡلِ مَآ ءَامَنتُم بِهِۦ فَقَدِ ٱهۡتَدَواْۖ وَّإِن تَوَلَّوۡاْ فَإِنَّمَا هُمۡ فِي شِقَاقٖۖ فَسَيَكۡفِيكَهُمُ ٱللَّهُۚ وَهُوَ ٱلسَّمِيعُ ٱلۡعَلِيمُ
And if they believe in the same way you have believed, they have attained guidance; and if they turn away, they are clearly being stubborn; so Allah will soon suffice you (O dear Prophet Mohammed – peace and blessings be upon him) against them; and He only is the All Hearing, the All Knowing.
Tafsir:
Allah said, if they, the disbelievers among the People of the Book and other disbelievers, believe in all of Allah's Books and Messengers and do not differentiate between any of them,
فَقَدِ اهْتَدَواْ
(then they are rightly guided) meaning, they would acquire the truth and be directed to it.
وَإِن تَوَلَّوْاْ
(but if they turn away) from truth to falsehood after proof had been presented to them,
فَإِنَّمَا هُمْ فِى شِقَاقٍ فَسَيَكْفِيكَهُمُ اللَّهُ
(then they are only in opposition. So Allah will suffice you against them) meaning, Allah will aid the believers against them,
وَهُوَ السَّمِيعُ الْعَلِيمُ
(And He is the Hearer, the Knower). Allah said,
صِبْغَةَ اللَّهِ
(The Sibghah of Allah). Ad-Dahhak said that Ibn `Abbas commented, "The religion of Allah." This Tafsir was also reported of Mujahid, Abu Al-`Aliyah, `Ikrimah, Ibrahim, Al-Hasan, Qatadah, Ad-Dahhak, `Abdullah bin Kathir, `Atiyah Al-`Awfi, Ar-Rabi` bin Anas, As-Suddi and other scholars. The Ayah,
فِطْرَةَ اللَّهِ
(Allah's Fitrah (i.e. Allah's Islamic Monotheism)) (30:30) directs Muslims to, "Hold to it."