The Rulings Entailed by One Who Insults Allah, His Messenger, and the Religion

You mentioned in the course of your discussion in the exegesis of the first verse of Surat al-Hujurat that one who insults the Messenger (peace and blessings be upon him) is killed, even if he repents. What is the basis for killing him? And what is your opinion regarding one who insults Allah (Glorified and Exalted is He), or insults the religion when someone rebukes him,Or when he is angry, he says: saying, "I curse your religion" or "I curse your Lord"?
As for the basis for killing him—meaning the one who insults the Messenger (peace and blessings be upon him)—it is because this is a right belonging to the Messenger (peace and blessings be upon him), and we must avenge our Messenger (peace and blessings be upon him) and kill him. If he has repented, he is like the other Muslims: he is washed, shrouded, prayed over, and buried in the Muslim cemeteries. As for the one who insults Allah and repents from his insult with a sincere repentance that we know to be truthful, the killing is lifted from him; because the killing is a right belonging to Allah, and Allah the Exalted has informed that He forgives all sins, saying: [Surat al-Zumar: 53] Likewise, the one who insults the religion is like the one who insults Allah; if he repents with a sincere, true repentance, we lift the killing from him.