اِنَّ الدِّيْنَ عِنْدَ اللّٰهِ الْاِسْلَامُ ۗ وَمَا اخْتَلَفَ الَّذِيْنَ اُوْتُوا الْكِتٰبَ اِلَّا مِنْۢ بَعْدِ مَا جَاۤءَهُمُ الْعِلْمُ بَغْيًاۢ بَيْنَهُمْ ۗوَمَنْ يَّكْفُرْ بِاٰيٰتِ اللّٰهِ فَاِنَّ اللّٰهَ سَرِيْعُ الْحِسَابِ ( آل عمران: ١٩ )
Innad deena 'indal laahil Islaam; wa makhtalafal lazeena ootul Kitaaba illaa mim ba'di maa jaaa'ahumul 'ilmu baghyam bainahum; wa mai yakfur bi Aayaatil laahi fa innal laaha saree'ul hisaab (ʾĀl ʿImrān 3:19)
Indeed, the religion in the sight of Allah is IsLam. And those who were given the Scripture did not differ except after knowledge had come to them – out of jealous animosity between themselves. And whoever disbelieves in the verses of Allah, then indeed, Allah is swift in [taking] account. (Ali 'Imran  : 19)
1 Mufti Taqi Usmani
Truly, the (recognized) religion in the sight of Allah is Islām . Those who have been given the Book did not differ (among themselves) until after the knowledge had come to them, (and all this) due to envy against each other. Whoever denies the verses of Allah, then, Allah is swift at reckoning.