Perhaps some supporters of the Hellfire theory will offer the idea that your "soul" is sent to Hell and not your body. If one is without their body, they are without cells, without neural receptors, and therefore without pain. These are scientific facts about pain that primitive cultures were not aware of.
It is truly amazing that Denis points this out because he is right! How can someone burn in hell forever? The answer to this question is only found in the Quran and in no other holy scripture.
I am going to quote from Dr Zakir Naik in his debate with Dr William Campbell "Qur'an And Bible In The Light Of Science ",which can be accessed here:
Previously the doctors, they thought that the brain was only responsible for feeling of 'pain.' Today we have come to know besides the brain, there are certain receptors in the skin, which are responsible for feeling of the pain, which we call as the 'pain receptors.' Qur'an says in such Surah Nisa Ch. 4, Verse 56, that. 'As to those who reject Our signs, We shall cast them into the hell fire, and as often as their skins are roasted, We shall give them fresh skin, so that they shall feel the pain. Indicating that there is something in the skin, which is responsible for feeling of pain, which the Qur'an refers to as 'pain receptors.' Professor Thagada Tagada Shaun, who is the head of the department of Anatomy, in Chang Mai University in Thailand, - Only on the basis of this one Verse, he proclaimed the Shahada, in the 8th Medical conference in Riyadh, and said .(Arabic).. That. 'There is no God but Allah, and that Prophet Mohammed, peace be upon him, is the Messenger of Allah.
So according to the Qur'an, new skin will be given to those who are burning in Hell. Remember what Denis said:
These are scientific facts about pain that primitive cultures were not aware of.
According to Denis, the Prophet (peace be upon him) could not have known about this scientific fact. This shows that its origin is from God. So instead of showing an error in the Quran, Denis points out a miracle! Thank you Denis!
The reason why the monks grew accustomed to the pain is because their skin was burnt off and therefore the meat under the skin does not feel the pain because there are no pain receptors. As long as there are pain receptors (found in the skin) then the person will feel pain. God will always make sure that there are those pain receptors (Surah 4, verse 56).
Also, Denis erroneously assumes that burning of skin is the only kind of punishment in hell while it isn't.