What percentage of believers (Christian mainly) do you think believe simply because they choose to?

We all know that most believers are indoctrinated and either believe in hopes of heaven or fear of hell. How many do you think simply believe because they choose to, and realize that most of their 'scriptures' are not historical documents?
Update: Kelly, gutbucket and Dean: All three of you should thank many of the believers who answered for proving the truth of your statements.
Update 2: Ceiling Cat: I think we've all seen people like that. They make the great folks in their religious community look terrible and ignorant by association.
Update 3: Purdey EP: One of the very few people I know of who can honestly make that claim. You have my deepest respect dear. *bows*
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