The bad guy dying was a terrible move
(English is not my first language)
"oh he is the bad guy, let just kill him"
No... he should not die at the end, Amy should.
Despite Amy had cancer she should "die in peace because she had Jesus in her heart", maybe they should put some familiar conflict (maybe her mother or father) that it got fixed by the end, near to her death, maybe that conflict opened her eyes so she start to see life in a different way, and than she find peace in her heart.
And at the end of the movie, they should give us some hint that professor Radisson maybe start to belive in God again, changing the sentence "God is dead" to "Is God dead?" letting his students showing their point of view