if allah so willed he could make you all one people but he leaves straying whom he pleases and he guides whom he pleases but ye shall certainly be called to account for all your actions.
ولو شاء الله لجعلكم أمة واحدة ولكن يضل من يشاء ويهدي من يشاء ولتسألن عما كنتم تعملون