Loglines are used to “Sell” your story. Maybe to a producer or maybe to a viewer. They have to grip the reader. You can’t give away the end but you do need to tell the story in as few words as possible.

After reading your logline I’m still not sure what happens in your story and as a result, I’m not compelled to keep going.

First: What will help is specifics. You say the girl disobeys her mother. Kids disobey their parents all the time, what makes this time compelling???

Fore-instance:
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“After a christian girl disobeys her mother and has unprotected sex with a man she believes is an Angel of God.”
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See now we know how the girl disobeys her mother.

Second: I am not sure how one would “Prove the sufficiency of Christ” I would be more specific. Tell us what must she “do”

She journeys to the Vatican to confess to the pope himself.

Now we know what it is she must do”

Be more specific and you will improve your logline.

Hope that helped, good luck with this!!!!