god has promised the righteously striving believers to appoint them as his deputies on earth as he had appointed those who lived before. he will make the religion that he has chosen for them to stand supreme. he will replace their fear with peace and security so that they will worship god alone and consider no one equal to him. whoever becomes an unbeliever after this will be a sinful person.
وعد الله الذين آمنوا منكم وعملوا الصالحات ليستخلفنهم في الأرض كما استخلف الذين من قبلهم وليمكنن لهم دينهم الذي ارتضى لهم وليبدلنهم من بعد خوفهم أمنا يعبدونني لا يشركون بي شيئا ومن كفر بعد ذلك فأولئك هم الفاسقون