The Ruling on Insulting Other Religions in Islam: Strictly Forbidden and Haram
In Islam, insulting other religions is haram. This prohibition is stated in Surah Al-An'am verse 108, which commands Muslims not to revile the objects of worship of others because it could provoke them to revile Allah SWT. This verse was revealed when some companions insulted the deities of the disbelievers, which only made them more stubborn and damaged social relations.
Islam also forbids mocking or cursing other groups, as Allah says in Surah Al-Hujurat verse 11. Preaching should be done wisely and politely, according to Surah An-Nahl verse 125 and Al-Ankabut verse 46, which emphasize using good words in discussion.
There is no specific punishment in the Quran and hadith for insulting religion, so its determination is left to the judge or government. In Indonesia, offenders can be charged under Article 156a of the Criminal Code with a maximum prison sentence of five years.
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