They feel that if God exists and is almighty and loving, the evil and suffering in the world cannot be explained.
فَٱلشَّيْطَانُ بَارِعٌ جِدًّا فِي إِعْمَاءِ أَذْهَانِ ٱلْبَشَرِ .‏ —‏ ٢ كورنثوس ٤ :‏ ٤‏ .‏