I find it strange that your objection to religion is believing in unproven things. I'm very uneasy with the organised structure of religions because I've seen them being abused for bad things so many times (although I acknowledge it doesn't have to be like that), but I don't see a problem in having faith in something (in the religious sense), as long as you don't try to force me to live by it...
I think it comes from people telling me “your mental health symptoms will go away when and only when you fully believe in this unproven thing.”
Listening to this and finding yourself unable to believe in the unproven thing (precisely because it is an unproven thing! WHY IS THIS SO HARD TO UNDERSTAND OMFG) even if you trytrytrytrytrysohard leads to “I am broken, always will be, and can never get better.”
PTSD does not work like that, and theism does not cure it. Plenty of theists have it even if they are fully confident God loves them/is looking out for them/is there for them/etc.