Despite Buddhisms many wrong notions (like reincarnation)
We do not know that, and neither do you. We live in a mystery in that regard. All we can do if we want to be truthful is admit we don't know what happens after death. We simply don't know. That's the truth
There's lots of evidence that thinking and consciousness require a functioning brain, therefore it is reasonable to believe that you cease to exist if your brain decomposes. At this point, if you want to believe in an afterlife, you need to propose a mechanism for transmigration. The wikipedia page on Bardo says "The intermediate being ...existence is demonstrated by the fact that it cannot have any discontinuity in time and space between the place and moment of death and those of rebirth, and therefore it must be that the two existences belonging to the same series are linked in time and space by an intermediate stage." Which doesn't even constitute evidence let alone proof.
you are clinging to your notions the same way religious fundamentals cling to theirs
You're making wild assumptions about my convictions. I was open to the idea of reincarnation for many years, now once again I'm open to the idea that our universe is statistically likely to be a simulation, therefore an afterlife is possible. It's just that there's only worthless evidence for an afterlife and strong evidence against it.