If you have not seen or experienced anything supernatural, it is only natural to be suspicious of those who claim they have and take a more empirical stance on the subject. I've been there too.
The mistake I have made, and that you and Derren Brown are currently making, is that when it comes to God, spirituality, faith, psychics, supernatural you are looking at it from a scientific point of view. Doing so you will inevitably hit a wall, find no evidence and no claims you cannot dismiss.
From a materialistic point of view, these things are unprovable. To progress your understanding you really have to think outside of the material box that you are in.
So you have found no evidence of souls, no evidence of God or anything supernatural? Don't let your search end here. Instead, let's employ a little philosophy:
Maybe there is a God, but he has deliberately made atheism a real possibility for you to believe in. Because you and derrin brown haven't experienced or found any evidence of the supernatural, doesn't mean it's not there, it could be that God doesn't want you to know of it. He's made atheism appear possible on purpose and wants you to explore it, if you wish.
So then we ask ourselves... Why is God essentially tricking us? Are there philosophical reasons for it?
Yes, yes there are. With 7 billion people on earth, billions of planets, our animalistic evolutionary background... People think there may not be a God. This in turn exposes sin. Simply, if someones being naughty they generally feel if their bad deeds are away from the police they've got away with it.
This now gives them (God, angels), who operate on our world... many choices. It allows them to deal with the sin - they can fate events so that the person can learn the consequence of their sin, and develop from it. Or, if the person is evil in the heart and will not learn, their sin can be used to create heroic and noble human experiencs... for instance a police officer could be fated to deal with the person and save an afflicted person. A relationship is born as the policeman helps an afflicted person; love and trust are developed. (Just an example, im sure you can think of many more)
Do you understand what i'm saying here? With the world how it is... it gives us a real chance to learn and experience good and evil. There is meaning and reason behind God making atheism appear a real possibility.