عَلَىٰٓ أَن نُّبَدِّلَ خَيْرًا مِّنْهُمْ وَمَا نَحْنُ بِمَسْبُوقِينَ Qur’an Al-Ma'arij (70:41)AAal a an nubaddila khayran minhum wam a na h nu bimasbooqeen a
The implication is that it is not His will to replace "those who are bent on denying the truth" in this world, by believers, inasmuch as such a "replacement" would not be in accord with His design of multiform human existence, in which faith is always challenged and tested by unbelief, and vice versa.