I agree that looking at it this way, you win.
You just have to understand that the desire to believe itself is strong. Why is this so?
(For us, fear of death etc...isn't enough to dissuade us from thinking that we are more than mere animals).
If prayer experiments don't show anything, then I'm not going to argue with the results. As far as I'm concerned, those results are exactly what God wants them to be. I am honest enough to even not argue if they indicate that God isn't there.
I suppose that for you, the simplest answer is that it's psychological. If it is, and there is no heaven, then sorry if I was wrong, because I didn't mean to be, I am just convinced that Christ is true. Can you understand?
If you can't understand, then all I can say is that it's what drives me, atleast. A bit like a supreme motivation that conquers everything else and makes it look silly. Ever felt it? Well, that's the feeling it is, but very strong, and it doesn't need a REASON because it's real.