Well, I have actually dealt with a very similar situation on more than one occasion, with some people in my life. So my advice comes from my experience.
I agree with what others have said about seeking professional help especially if they have an established plan to take their own life. And I second what @Joshua_Hansen said about it not being our job to fix them, however it can feel like the burden falls on you.
Here are my recommendations:
-allow them to talk and be angry. They are angry with God for a reason so if they open up to you, be sympathetic and listen with the intent to understand their thoughts and feelings.
-avoid quoting scripture or telling them they “shouldn’t be_________.” When I was angry with God, quoting scripture to me just made me more angry. It made me feel like people cared more about not being angry with God then with why I was feeling that way.
-make sure you have support from trusted friends and family. These situations are emotionally and mentally exhausting so take care of yourself too
-pray for them and for yourself
-depending on the situation, be a source of distraction for them. Take them out and do something fun, something you know they would enjoy
The pain that people go through in life can be absolutely horrible, and life can seem like a “twisted joke.” Eventually Aaron needs to decide for himself what he will do, will he make the most of life despite the circumstances that arise?
Hope this helps
Will be praying for you guys as this situation is all too familiar. And remember you do not need to be all things and this can hard to accept when you care deeply for someone.