The word 'religion' is only a label. What lies behind that, the most important thing of all, is the word 'faith'. You either have faith, or you don't have faith, or you have degrees of faith - and if you have degrees of faith, then you become agnostic. You're kind of in-between, or you're on the fence.
Taking a comic strip character is very hard to write. Because comics are meant to work in one page, to work in frames with minimalistic dialogue. And a lot of it is left to the imagination of the reader. To do that in film, you've got to be a little more explanatory. And that requires a good screenplay and good dialogue.