Burning heretics alive was a common practice in medieval Europe. I cannot begin to imagine the depravity of the mind that invented this cruelty, let alone the inhumanity and callousness of those who carried out the act. Sometimes an individual would take pity on the victim and hide gunpowder among the wood faggots to hasten their death.
There is only one way to make this scenario even more depraved, infinitely depraved in fact; and that would require magic powers. Imagine you could make it so that the victim never found escape from their agony through death, not just to extend their pain for a few hours or days but literally for all eternity.
Now imagine you could impose this penalty on untold millions of humans; not as a punishment for hideous acts against others but for thought-crimes.
Anybody who can worship and adore a deity who invented this incredible depravity is a moral imbecile. Christians believe they can celebrate in heaven, eating, drinking and praising their god within sight and sound of a scene that would make Auschwitz look like a holiday camp.
Christianity is a death cult and its most ardent followers are sadists.