For the moment I'll set aside the issue of religious faith and concentrate on more mundane instances of belief.
If a belief can be chosen, if it's a simple act of will, then it should be easy for me to choose to believe that George W. Bush is a lesbian. But I can't. I keep trying, but experience and definition get in the way, suggesting to me that my choices in belief--if they exist at all--are subject to my sense experiences and my ability to reason.
But I'm open to the possibility that I'm wrong. Anybody have a nuance I'm missing?