Surah Ali 'Imran 3:85
وَمَن يَبْتَغِ غَيْرَ ٱلْإِسْلَٰمِ دِينًا فَلَن يُقْبَلَ مِنْهُ وَهُوَ فِى ٱلْءَاخِرَةِ مِنَ ٱلْخَٰسِرِينَ ٨٥
EnglishSahih International
And whoever desires other than Islam as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers.