I doubt spiritual beliefs, or lack thereof, have much to do with one's level of personal happiness.
But it might have SOMETHING to do with it; with loss of faith one gains a sense of freedom from burdensome religious guilt, from books, people, tv, deep-seated conditioning, etc.
Once free of THAT, it might make dealing with other problems easier, if not solved.
However, some things might get harder! Maybe a 'crutch' is lost, or friends disappear, or gone is the comfort 'god' is intimately involved in your life.
Like drinking...stop, and lots of things get better; BUT lots of lesser things get lost. It takes time and effort to sort it all out.
Overall, I feel closer to the truth, more appreciative of my life in general, which makes it a net gain.
That said, it's very hard for me to accept many of the things about the way I am. Nor do I think I SHOULD accept them, if I think they can be ultimately improved.
Tricky.
One thing makes me feel better is knowing in the end it really doesn't MATTER all that much!

Yes, but how? There's always a diagnosis, but how about a treatment?

Good thought

Wise words. Learning to live by myself will take time. I'm happy for the first time in a long time. Wasn't sure how I would feel living alone. I like it and I like me again. Getting the negativity out of my life has given me a chance to feel good about myself again. I have choices now. I have freedom now. I am building my own world. I still have highs and lows like everyone else but I decide how I want to feel about my children and friends I've made. No one else can tell me how to feel.