When Christians start thinking about Jesus things start breaking down they lose their faith. It's perfectly possible to go to church every Sunday and not ask any questions just because you like it as a way of life. They fear that if they ask questions they'll lose their Christ the very linchpin of their religion.
If faith is lost there is no security and there is no life for him who does not adhere to religion.
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My gut feeling about sequels is that they should be premeditated: You should try to write a trilogy first or at least sketch out a trilogy if you have any faith in your film.