Summary of the concepts of Ahl al-Sunnah Heresy (Ilhad) "Alhada" means to deviate. To deviate in Allah's religion. Meaning to deviate from it and turn away. And so-and-so deviated. He turned away from the truth. And introduced into it what is not from it. And he committed heresy in the sanctuary. He deemed its sanctity permissible and violated it. And heresy concerning Allah's names, Exalted is He. Deviating from what they are. Whether by negating them, distorting their meaning, or naming other than Allah with them, such as idols and false deities. Allah, the Almighty, says: “Allah's are the fairest names. Invoke Him by them. And leave the company of those who blaspheme His names. They will be requited what they do.” (7:180) “Allah's are the fairest names. Invoke Him by them. And leave the company of those who blaspheme His names. They will be requited what they do.” (7:180) “Allah's are the fairest names. Invoke Him by them. And leave the company of those who blaspheme His names. They will be requited what they do.” (7:180) And heresy concerning Allah's signs, Exalted is He. To deviate from the truth out of stubbornness, denial, and arrogance. And from this is Allah's saying, the Almighty: “Lo! those who distort Our revelations are not hid from Us. Is he who is hurled into the Fire better, or he who cometh secure on the Day of Resurrection? Do what ye will. Lo! He is Seer of what ye do.” (41:40) And the common usage in our time is to use the word "heretic" (mulhid) for one who deviates from the truth by denying the existence of Allah, Exalted is He.