Does something exist if we don't beleive in it?

Here's some interesting questions to ponder.

Does God exist if people don't believe in him?

Does he not exist even if people believe he does?

Will prayer work on someone who doesn't believe in its power?

Will the power of EFT (Emotional Freedom Techniques) work even if you don't believe in it?

Does our mind hold enough power to block manifestations of "happiness" just because we have a deep seated belief that we really don't believe we deserve to be "happy" (Happiness being whatever we feel would make us happy ie: money, career, relationships, weight-loss, etc...)

I watched a video yesterday by Bruce Lipton and he explains the power of the mind like no one else (http://www.2011tappingworldsummit.com/VideoSeries/?page_id=60 and click the Bruce Lipton tab if it doesn't open on his page) (and let me say as well that I am not advocating this site as the interview he gives here is also available on YouTube but it's all chopped up and not complete).
He talks about the programming that runs our lives at a subconscious level and how the subconscious is a million times stronger than the conscious mind which is usually not in the present as it thinks of future times when we will be happy or doing something that will make us happy. We run on auto pilot with old and outdated programming, (it's an eye opener!) and we wonder why we aren't happy.
But we can change the programming and live better lives.

I've been researching EFT these past few days and I've tried some of the tapping sessions and I've hit some emotional points and was quite surprised at what I discovered.

So, even though I am still skeptical that EFT works, does it work in spite of a persons belief?