Influenced by what we observe, we choose to preach the observations that we agree with.
Here's my view on the next stage. If there was a heaven I wouldn't want to go there for eternity. I wouldn't want a conscious mind that went on forever. Just take vision for an example. If you were just a pair of eyes that could observe anything would there be any differences between looking at emptiness forever or looking at an infinite amount of pictures forever? Would there be a difference between feeling happy forever or having a wildly-ossolating-never-ending-emotional rollercoaster ride?
There was no suffering before we were born and I would hope that I could return to that state of not being anywhere or anything.