What is the Islamic ruling on a Muslim man who curses the religion
Reference: qsep.com
Q: What is the Islamic ruling on a Muslim man who curses the religion?
A: Cursing the religion is one of the greatest sins and it is a violation of Islam, we ask Allah to keep us safe.
One who curses Islam or the Prophet of Islam or curses any other messenger will have apostatized Islam, we seek refuge with Allah.
This ruling applies if one curses the Prophet or curses Islam in any way, such as saying that Islam is an inflexible or incomplete religion or is just an opium for the people, or similar demeaning words; these are all forms of cursing, and one who commits this is an apostate, who should be made to repent or else should be killed.
Here, some scholars believe that such a person should not be made to repent, but should rather be killed right away, as is the case when one curses Allah (Exalted be He) or the Prophet (peace be upon him). In other words, cursing Allah, His Prophet or His Religion is apostasy from Islam.
In this regard, the Prophet (peace be upon him) said: "Whoever changes his religion, kill him."
It is an obligation on one who commits this to offer Tawbah (repentance to Allah), and to return to Allah, regret the sin which they have committed and increase their good deeds, so that Allah will forgive them. As for rulers, they are obliged to force those who have committed this sin to repent, reprimand, discipline and deter them and their likes from such sins.
As for acceptance of one's Tawbah, scholars have different opinions in this regard. Those who believe such repentance likely to be accepted ground their opinion on reasonable grounds, while those who believe that such a sinner should be killed and their repentance will not be accepted draw on plausible argument, namely that this is to deter others from being negligent in this matter, and it entails protection for the Religion of Allah, veneration for Allah's (Exalted be He) Majesty and respect for the Prophet (peace be upon him).
As for saying: Such a person's Tawbah is formally accepted or not accepted, this is a controversial issue among scholars.
As regards the relation between a person and Allah, such Tawbah is likely to be accepted if one is sincere in their Tawbah and if they return to Allah and regret their sin. This is maintained by the categorical denotation of Shary (Islamic legal) texts indicating that Allah (Glorified be He) accepts the Tawbah of His Servants.
He (Exalted be He) says: "And all of you beg Allâh to forgive you all, O believers, that you may be successful"
For, Tawbah has great significance, if the servant offers it sincerely, regretting and abandoning their sins, both major or minor, and mend their ways. As regards whether the ruler should accept a person's Tawbah in this worldly life (and in turn pardon them) or should (disregard it and in turn) kill them, this is a controversial issue.
Thus, scholars who are against accepting such Tawbah claim that cursing is a great sin, and by accepting such Tawbah of the sinner, other people will become lenient in this matter. It is for this reason that some scholars believe such a sinner should be killed and their Tawbah should not be accepted by the rulers in order to eliminate that evil and protect the Religion of Allah and His Prophet against mockery or ridicule.
Allah is the One sought for help; there is neither might nor power except with Him, the Most Exalted and Most Great.
Cursing the religion is a sin that is committed by many foolish persons, and therefore it is an obligation upon all Muslims to guard against this.
They should watch their words and avoid cursing Allah, His Religion or His Prophet, or cursing Jannah (Paradise) or anything else related to Allah's Shariah. All Muslims, males or females, should guard against cursing whatever Allah (Glorified and Exalted be He) has made inviolable.
He (Glorified and Exalted be He) says: "Say: "Was it at Allâh (عز وجل), and His Ayât (proofs, evidence, verses, lessons, signs, revelations) and His Messenger (صلى الله عليه وسلم) that you were mocking?" Make no excuse; you disbelieved after you had believed."
When the Prophet (peace be upon him) heard that a person killed his female slave because she used to curse the Prophet (peace be upon him) - knowing that her master first invited her to repent and when she refused it, he killed her -, he (peace be upon him) said: "I bear witness that her blood was not spilled unjustly"
This was because she cursed the Prophet (peace be upon him). That is to say it is an obligation on the Muslims, males and females, to guard against this sin, or this great crime. May Allah grant us all safety and wellbeing.
Fatwas of Nur `Ala Al-Darb>Volume 4>Chapter on the nullifiers of Islam>Ruling on a Muslim who curses Islam
Reference: qsep.com