فَإِن آمَنوا بِمِثلِ ما آمَنتُم بِهِ فَقَدِ اهتَدَوا ۖ وَإِن تَوَلَّوا فَإِنَّما هُم في شِقاقٍ ۖ فَسَيَكفيكَهُمُ اللَّهُ ۚ وَهُوَ السَّميعُ العَليمُ

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, and Allah will be sufficient for you against them. And He is the Hearing, the Knowing.