the Messenger of Allah ﷺ said: "Whoever says: 'I have nothing to do with Islam,' if he is lying then he is as he said, and if he is telling the truth, his Islam will not be sound." (Using translation from Ibn Mājah 2100)  

قَالَ رَسُولُ اللهِ ﷺ «مَنْ قَالَ إِنِّي بَرِيءٌ مِنَ الْإِسْلَامِ فَإِنْ كَانَ كَاذِبًا فَهُوَ كَمَا قَالَ وَإِنْ كَانَ صَادِقًا لَمْ يَعُدْ إِلَى الْإِسْلَامِ سَالِمًا»