I (God) refer as “You” in the Quran is for the entire mankind, not to a follower of Islam by birth, by shahada or by the fundamental guidelines 

The word referred as the “Believer” in the Quran is referred to a purified soul, not to a follower of Islam by birth or by shahada

Whoever “REALIZE ME (God)” within, before or after death is a Muslim and he is in Islam

He who knows himself, knows me (God) – Sayings of Muhammed (pbuh)

Whoever fails to REALIZE ME (God) will be blind on earth as in the hereafter