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I don't think you bothered reading my reply. Whatever i wrote is my view on this. your replies after that are redundant.
I don't understand when you say ISIS follows sunnism or distorted sunnism. Sunnism is already distorted how can you classify it like that?
As for the smiling dead:
Our brains are designed with many types of receptors and glands that releases chemicals either by themselves or by inducing it with an external composition.
for example, When someone drinks ayahuasca which contains DMT, a type of chemical composition, They will experience lucid visions in which they are able to interact with.
Our brains contain slots, or key holes for specific chemical compounds found in nature. In the case of DMT, the DMT compound naturally finds its way to the key hole which is a perfect fit only for DMT. There are receptors that are specific for THC( mostly found in marijuana) and other types of drugs that are able to influence one's psyche.
When one dies, The brain releases chemicals like these naturally in abundance without the need for the keys like DMT or THC The effect is a bliss like feeling 100s of time stronger than what the brain produces during sleep.
The same thing happens when you feel extremely happy. It is because your brain releases these chemicals naturally.
Simple as that. I do not know why you need to ask this as if it is a phenomenon when it is not.
Everything in this world has an explanation to it. We live within the bounds of scientific laws created by God. Some of which we understand, and many others we do not. Many times, what we do not understand we label as miracles.