I put this here because I smell a debate.
“Wives, likewise, be submissive to your own husbands, that even if some do not obey the word, they, without a word, may be won by the conduct of their wives, when they observe your chaste conduct accompanied by fear.”
I Peter 3:1-2
I think the point was, he was beyond listening to her. Even if she had confronted him he would’ve just gotten madder and the situation would be even worse.
I know people in real life who struggle with problems like this and I can say the way they presented it seemed very accurate to me.
Also, keep in mind that the writers are not trying to model a perfect Christian, they are trying to show that God will work through imperfect people (good thing cause nobody’s perfect), and hears us when we pray.
I think the advice she gave was a mixture of scripture and personal experience. I don’t know that I’d call it wishful thinking. 
Here are some verse that talk about how we should pray.
“Rejoice always, pray without ceasing, give thanks in all circumstances; for this is the will of God in Christ Jesus for you.”
1 Thessalonians 5:16-18
“But when you pray, go into your room and shut the door and pray to your Father who is in secret. And your Father who sees in secret will reward you.”
Matthew 6:6
“Therefore, confess your sins to one another and pray for one another, that you may be healed. The prayer of a righteous person has great power as it is working.”
James 5:16
“For we do not have a High Priest who cannot sympathize with our weaknesses, but was in all points tempted as we are, yet without sin. Let us therefore come boldly to the throne of grace, that we may obtain mercy and find grace to help in time of need.”
Hebrews 4:15-16
I didn’t post the Lord’s Prayer because I think we probably all know it. 
I think you guys opinions are fine, I just wanted to say why I like the movie.
Not trying to convince you that you have to like it too. 