إِنَّ الدِّينَ عِندَ اللّهِ الإِسْلاَمُ وَمَا اخْتَلَفَ الَّذِينَ أُوْتُواْ الْكِتَابَ إِلاَّ مِن بَعْدِ مَا جَاءهُمُ الْعِلْمُ بَغْيًا بَيْنَهُمْ وَمَن يَكْفُرْ بِآيَاتِ اللّهِ فَإِنَّ اللّهِ سَرِيعُ الْحِسَابِ
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سورة آل عمران
(3/19) Truly, the Religion with Allah is Islam (religion of submission). Those to whom the Book had been given, differed, out of mutual envy, after knowledge had come to them. And whoever hinders (disbelieves) the Verses of Allah, then surely Allah is Swift in reckoning.
Surah Al Imran