And Certainty is what creates Hell.
As Einstein observed:
When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute -- then it's longer than any hour. That's relativity!
It occurs to me that moral relativity creates its own hell. It is entirely possible that the afterlife of Catholicism and Tibetan Buddhism is indeed just an effect of a dying brain- but that doesn't make it any less real to the brain that is experiencing it. Just because you can explain a miracle or curse, doesn't make it any less of a miracle or a curse.
As 2000 years of research into Near Death Experiences in the Tibetan Book of the Dead explains, time no longer exists for you once you are dead. If you have a yidyam, a savior- even an evil one- you will be tempted to go to their place. But place, as John Paul II is entirely the wrong way to look at it- it is instead, a State of Mind. What if the afterlife, as we experience it, is *both* joining with the divine (or the evil) AND the final "letting go" where the brain freezes all memory into a permanent state, and can learn nothing more due to the lack of oxygen to keep the cells "alive and growing"?
In this way, if you are so certain as to become disobedient in this life- then your certainty, frozen at the moment of death, is what will create Hell for you.
Likewise if you are so open to faith and belief that you die happy- truly in joy at the prospect of worshiping God forever- then Purgatory/Bardo will freeze your brain into that happiness for all eternity.
There is of course one other option, according to the Tibetan Book of the Dead, that Christianity has no knowledge of- If you are truly committed to Atheism, and able to resist the temptations of the Gods and Demons- then you are rewarded with reincarnation, another spin at the wheel of life. This is what the Dali Lama preaches and apparently, has accomplished repeatedly (that's how you get to be the Dali Lama). But another interpretation of that is this- that Atheists have missed the point in life, and therefore, are sent back to get another chance. And that is Hell in and of itself.
Having contemplated the last things, I return to certainty and the scientific method. The scientific method requires that any given hypothesis, even a scientific law, be open to new evidence. Certain people are not open to new evidence- as my T-shirt in my Senior Picture back in high school loudly proclaimed "My mind is made up, don't confuse me with the facts". This is NOT a scientific way of thinking- it is more faith based than a Westboro Baptist claiming not to be a Christian but rather a reincarnation of the bodyguards of King David. I wish somebody had warned me about certainty when I was young. Rational thinking has no room for certainty, no room for ideology, no room for blind obedience. The Truth must find YOU, you are incompetent to find the truth on your own.