if you don't have to behave well to get the religion's reward then none of the objective morality/moral standard arguments for religion work and people would likely ask what the point of even pretending to believe in it is. if you're not going to use your church to impose moral standards or any kind of aesthetic ideal for how to live life, why are you wasting anyone's time preaching? it's obvious that sola fide exists for someone who's not quite ready to say christianity isn't real but wants to act like it isn't real.
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