How can you believe in something if you don't have any facts that can prove it?
I have to admit, that if you don't have any fact, I am very sorry...but everyone can tell anything what came to one's mind...
I work in hospital over a year, and I have never seen anyone who really believe in soul. Because they fight for life right now, as everyone understands...that there is nothing after death. 
Or you have plans for what would you do on Heaven? Just interesting, what are you going to do there? Any ideas?....right..because we live here, right now..and here are all plans..

We get sorted to Heaven and Hell, based on our actions in the past. There is no scientific explanation but you can't talk to dead people so you have to believe, with your whole soul, and be a good person and have a kind heart and everything will be OK.

What‘s a soul?

Right. But the soul is neither mass nor energy. This is just human's emotional imagination.