I understand that the point of the movie is about '**letting go** of hatred and sadness which was caused by a great injustice' and it's a good message.

But doing so in a religious setting, where God is literally in front of you and can answer your questions, without addressing the question of why did God allow the injustice to occur in the first place, is impossible.

It's Ok, to 'let go' in a religious setting, where God is there but doesn't answer you directly. So you assume he has a plan or that he has some reason. Or even without it, just your faith helped you through it. But here, Mac asks God point blank "Why did you let it happen?" and there is no answer. Some mambo jumbo and evasive talk about "I'm always with you" but no actual reason, logical or otherwise.

Again, I get that the point of the movie is not to explain why God allows bad things to happen, but in this case, you can't divorce the two.
It's like a person breaks into your house, rapes, and murders your wife in front of you, and then consoles you on the virtues of 'letting go and moving forward'.

I would say it's Christain propaganda, but it seems that hardcore Christians think it's heresy to depict God as a woman.