I choose not to.
Oh, come on, don't be such a wet blanket. Give it a try. Seriously. It's a good experiment and makes a really good point.
We get a lot of flack from xians about how we choose to reject god. But it was not a choice for me. It was a realization that I could not believe any more. I'm sorry to draw the comparison to Santa, but that is exactly what it was like. Once I knew Santa was a fake, I could not unknow the things that lead me to that conclusion. I was kinda pissed, because I felt like I lost something, or someone.
It was the exact same feeling when I finally admitted to myself I was an atheist. I'd known for some time that none of it added up and I'd tried to make compromises and excuses. But I felt like I was losing something again.
I have had a ton of xians tell me I just had to choose god again. But I can't. It would be like trying to choose to believe in Santa again.
So, give it a try. Try to choose to believe in something you know is fictional. Tell us how it goes.