There is no God willing to torture you for an eternity, because eternal torture is boring.
There is no eternal happiness either.
Eternal happiness requires both eternal awareness and your freezing in a particular state, but if you don’t change awareness is zero, therefore happiness is maximum right before it changes you so that you lose it. This paradox makes heaven weird.
There may be eternal bliss, which is the unaware perception of completeness. Some orgasms and some meditation, sometimes bring a fleeting bliss, both lowering your awareness.
But, if you don’t fall back, is bliss still enjoyable or suffocating? Really, I don’t see why eternal bliss should necessarily be a reward.
If your self is beyond biological processes, maybe upon the end of life support the self remains imprinted in the stuff that this particular one or all universes are made of.
However, missing perception, you will very likely be lost to yourself.
There is an actual objective and “scientific”, as in not wishful thinking, point in that information is never lost, and if and only if the self is not at all phenomenologically explainable, but instead it is pure information, it may stick around forever, bound into what ever it is that all these “particles” spawn from.
There may even be the possibility that biology devised neural tissue to be so amazing that it acts like a dream catcher fishing out past selves from the fabric of the universe.
But all that, as soon as the speculation feels good because it serves our hopes and wishes, all that is probably false.