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Al-Irtidaad (to renegade from Islam)
The religion of Islam is the most perfect and complete religion. The laws of Islam are flawlessly designed by Allah. These laws of Islam are for the benefit and of mankind.
Islam induces unity and always condemns division and sects.
Once a person accepts Islam, he sees its beauty and perfection. If after seeing the beauty of Islam, a Muslim turns away from it, it means he turned away from perfection towards imperfection, disassociating himself from the unity of the Muslims ummah towards a way that is unacceptable by Allah.
Allah always wishes good for His servants. By one accepting Islam, he will be Insha Allah entitled to paradise. However, after accepting Islam, one turns renegade, it means he has become entitled to Jahannam (Hell). This is not what Allah wishes for His servants. To prevent more people from becoming true candidates of the fire of Hell, Allah legislated a deterrent for it, i.e. the law of execution.
This law of executing the renegade is a unanimously accepted rule according to all Muslims.
Al-Hadith
Sayyiduna Ibn Abbaas radhi allahu anhuma says: Nabi sallalahu alayhi wasallam said “Execute the one who renegades from his Deen.” (Sahih al-Bukhariy Hadith6299, Sunan al-Nasaa’iy Hadith4059 edited by Shaikh Abdul Fattah Abu Ghuddah)
Sayyiduna ‘Uthmaan radhiyallahu anhu narrates hearing Nabi Sallallahu alayhi wa sallam as saying “……The one who changes his religion after accepting Islam must be executed.” (Sunan al-Nasaa’iy Hadith4057 edited by Shaikh Abdul Fattah Abu Ghuddah)
Sayyiduna Abdullah radhiallahu anhu narrates Nabi Sallallahu alayhi wa sallam as saying “It is not Halaal to kill a Muslim except for 3 reason: …no.3.The one that turns away from his Deen, thereby disassociating himself from the group of Muslims.”(Sahih Muslim Hadith4351 edited by Shaikh Khalil ma’moon Sheeha)
Ijma’
The one who renegades from Islam must be executed is the unanimous verdict of the sahaaba, none of them rejected it.
The unanimity of the Sahaaba on an issue is conclusive evidence of the same.
The Fuqaha (Jurists)
All the 4 Mazhabs are unanimous that a renegade must be executed if he does not revert to Islam. Hereunder are classical texts from each of the 4 Mazhabs:
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Al-Hanafiyyah
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Imam al-Marghinaaniy says: "If a Muslim, may Allah forbid turns away from Islam, the religion of Islam should be presented to him. If he has any doubts they should be cleared…and he should be kept under supervision for 3 days. If he reverts to Islam, he must be set free, otherwise he should be executed. (Al-Hidaya)
Allamah Ibn ‘Aabideen says: “Note well! It is unanimous that a renegade from Islam must be executed” (Rasaa’il Ibn Aabideen)
Al-Maalikiyyah
Imam Maalik says: “The one who renegades from Islam to another religion and exposes it will be asked to repent from his action. If he does not repent, he must be executed.” (Al-Mu’atta lil Imam Maalik)
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Al-shaafi’iyyah*
Imam al-Shaafi’iy says: “One who renegades from Islam will not be left alone, either he reverts to Islam or he will be executed.” (Kitab al-Umm)
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Al-Hanaabilah*
Allamah Ibn Qudaama al-Hanbaliy says: “All the scholars are unanimous that a renegade must be executed.” (Al-Mughniy with Sharh al-Kabir Vol.10 Pg.74 Dar al-Kutub al-Ilmiyyah Beirut)
From the above it is explicitly clear that there is no leeway in the religion of Islam regarding executing a renegade from Islam.
Mr. Popat, you’re a Ahmadi, nothing for you to worry about on this issue. 
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