You say God, I say Derren Brown.

Look at what the brain can do or make you do... 

http://www.youtube.com/watch?v=f29kF1vZ62o

http://www.youtube.com/watch?v=My67277vaGk&feature=related

http://www.youtube.com/watch?v=AMsngNWMfH4&feature=related

http://www.youtube.com/watch?v=8ZohpDS2aMc&feature=related

and last but not least... 

http://www.youtube.com/watch?v=IOEKdaXIEHc&feature=related

So it's all in our heads.