chrwe:
I haven't had an NDE, but one of the reasons I'm able to believe what some NDErs say, is because I had an experience like an NDE without a near death event taking place.
The key thing about my experience is that as it took place I had no doubt about what I experienced and what I understood. I understood in a manner that was much vaster, deeper, clearer and certain than how things tend to be understood while in this world.
Besides the experience I speak about above, I've had numerous other experiences that have made me certain that the afterlife exists. It makes a "HUGE" difference to know that the afterlife exists. I'm grateful I've been able to become certain.
It is hard to say all of the reasons some people become certain, while others don't. I believe Bruce Moen is correct when he says that the more you grow in PUL (pure unconditional love), the easier it is to make contact with positive parts of the spirit world. This is how it has been for me. Partly because my vibration has become more like the vibration of beings who live in higher realms. I still have some work to do.