I 'believe' it for a number of reasons Martin (one reason being that I have 'seen' along with hubby 'seeing' at the same time) - its not just 'blind faith' - not when a person has had personal proof. Also with regard to anyone who hasn't seen - well just because you can't see something, it doesn't mean that it isn't there or it doesn't exist. If you want to learn more about what I have been going on about - then do some research and visit a Spiritualist Church (if you look on the internet you will probably find one near to where you live). That is how I learn't about it - and I am still learning 
I agree with you Jan that just because I can't see something doesn't mean it's not there. But if one person can see something, then, scientifically speaking, you'd expect others to be able to see it too. On the other hand, the power of one's mind to convince oneself is quite astounding.
Nothing can be proved either way, but I tender the fact that my view is simpler than yours - that something seen by one where others look and can see nothing, is more simply explained by a mistake, a deception or an illusion than it is by postulating existence after one's brain has been destroyed.
Just because we weren't living on Earth for a time before our birth, does not mean that we did not exist Martin.
Indeed there are other possibilities, but again, the postulation that our 'souls' have been contained in other bodies prior to our birth seems unnecessarily overcomplicated when compared to the observation that, as our brains form and develop so does our intellect and our personality. I see no necessity to propose the existence of a soul as something separate from that. To me it seems like saying that, when I fry an egg and the white goes white, this is not down to the proteins denaturing because of the heat, but down to an unseen and unmeasurable cosmic force instigated by the action of frying, that just happens to coincide with the application of heat. The second explanation is possible, it fits all the facts, but it is preposterous because there is a perfectly good and reasonable much simpler explanation to hand.
Well the real sciencey bit is that energy cannot be created or destroyed Martin - it is the first law of thermodynamics. Look it up if you don't believe me. Energy cannot be created or destroyed, only converted from one form to another
Why should I not believe you Jan? I was a research scientist for a number of years after all! The energy that makes me me and you you is easily identifiable. It's held in chemicals and heat in my brain and yours. Talk of 'beings of light/spirit/souls/, that which is really 'us', going somehwere after physical death' is nothing to do with energy not being created or destroyed - the energy which makes me and you only does so while it is in the circuitry of our brains, after that is dissipates because of the second law of thermodynamics. If you want an analogy, we are like a computer program running in a computer with no permanent storage (only battery backed). When the power is switched off and the battery runs down to nothing, the program ceases to exist.
There are different types of energy Martin. The physical electro chemical energy in human brains is just one type of energy.
True - all of them are measurable and detectable by anybody, not visible to some and not to others.
Remember before (in previous discussions on this subject) I mentioned about the brain being a type of 'interface' for the mind & soul/spirit?
No, the brain is an interface into the bloob, the bloob holds only memories of ice cream and peanut and discards all others. - I've just invented the bloob btw, but there is as much proof and reason behind its existence as your postulation, the 'soul'. Yes BOTH the soul and the bloob are possibilities but there is no need to postulate either. There is a much simpler, much more obvious explanation.