Why does God—if He exists—allow humans to destroy one another?

The existence and oneness of Allah are proven by many pieces of evidence, including the creation of humanity itself. Discussion with atheists begins by proving the existence of Allah, His wisdom, and His knowledge, then explaining the wisdom behind their creation for His worship and their trials in life. Injustice and corruption are part of this trial and test, which are based on will and choice. If Allah willed, He could destroy the wrongdoers, but He grants them respite. Furthermore, Allah’s victory for believers, despite their weakness, is proof of His power. Discussions with atheists should be undertaken by those firmly grounded in knowledge to avoid misguidance. It is preferable to refer atheists to specialists, and one should beware of befriending disbelievers and atheists.