Verse 2:137

فَإِنْ آمَنُوا بِمِثْلِ مَآ ءَامَنتُم بِهِۦ فَقَدِ ٱهْتَدَوا ۖ وَإِن تَوَلَّوْا فَإِنَّمَا هُمْ فِى شِقَاقٍۢ ۖ فَسَيَكْفِيكَهُمُ ٱللَّهُ ۚ وَهُوَ ٱلسَّمِيعُ ٱلْعَلِيمُ

So if they believe in the same as you believe in, then they have been [rightly] guided; but if they turn away, they are only in dissension. So God will suffice you against them, and He is the All-Hearing, the All-Knowing.