Ali 'Imran 3:85

وَمَن يَبْتَغِ غَيْرَ ٱلْإِسْلَـٰمِ دِينًا فَلَن يُقْبَلَ مِنْهُ وَهُوَ فِى ٱلْـَٔاخِرَةِ مِنَ ٱلْخَـٰسِرِينَ

Waman yabtaghi ghayra l-is'lāmi dīnan falan yuq'bala min'hu wahuwa fī l-ākhirati mina l-khāsirīna

And whoever desires other than Islām as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers.