An estranged couple begrudgingly accepts a mission to rescue an atheist with the hopes for reconciliation, but in Hell nothing but hate can survive.

Hey Chris! Let’s get stuck in here. There is an interesting element here but it’s messy. Let’s break this down by asking a bunch of questions to answer The Big Three – the hero, goal, and problem;
1) Hero/heros? “estranged couple” Okay, I’ve got that. Could use a little more but I’m happy to buy into it.
2) Goal? “rescue an atheist with the hopes for reconciliation” This could be written a little better. I love “rescue an atheist” as a Catholic myself I find that a brilliant perspective shift, kinda like The Screwtape Letters. “hopes” isn’t strong enough. This fella needs to be on the verge of converting.
3) Problem (insert states)? “but in Hell, nothing but hate can survive.” This is confusing, where is this film set? If it’s on Earth then why do we care about the state of Hell? Also, when it comes to Hell, we all get the picture that Hell is a shitty place and its full of hate and fire bla bla bla so you probably don’t need to note any of that. What happens if they don’t work as a team? If this particular guy/gal turns to the ‘dark’ side (I’m assuming God is the dark side from their POV haha) then he is going to bring heaps of souls with him? Why does the devil need this particular soul and what is at stake for this particular couple if they fail?

I hope this help. Keep up the good work and I hope you get this made.