Well, speaking purely personally, it has certainly helped ME be/become/work on being a better person, with the emphasis on community and helping others and seeing the divine in other people, and just about every other aspect of life.
I can't say and won't say that I'm a truly 'good person' but I know for certain that I am FAR better than I would be otherwise, and there's always room for improvement!
I think being Jewish gives one structure: a framework of thought, a liturgical awareness and a liturgical structure.
We should probably attend services more but observing Shabbat in the home, looking at social and political events through a Jewish prism, feeling and acting upon a general obligation of tikkun olam make me the Jew I am.
Should I be more observant? Of course, but we're all a work in progress, eh?
Don't remove it, Shira - whatever 'faith' is for, whatever 'belief' is for, or whatever these do for us, or for the world, or 'for God' (if at all), the least we can say, is that we should be helped to become better, isn't that right?
I think that nobody would choose to go/join any group/activity that says 'we will make you worse off'', surely. Don't we tend to move TOWARDS hope and better things?
Becoming a Jew does mean 'giving up' certain things - as mundane as cheeseburgers, as important as family ties - surely we can all say that becoming a Jew also means GAINING something as well?
'Peace of mind' or 'a challenge to work toward' or 'hope for the world' - but something.
I'm not sure that I'll be able to explain this very well, but I think that even though whatever is the cause of your stress may be out of your control, you do have some choices in how you respond to the situation, and being Jewish gives you access to so much rich history, guidance, information on how others have coped or not coped, both through the Torah and through community support and advice, so you can reflect and consider what you can best do in the circumstances. Also, we are taught that in order for God to help us, we must also help ourselves - before we can win the lottery, we must first buy the ticket. So we are encouraged to be self-reliant and do what we can to improve our situation.
I totally agree with what Simcha posted in the number 1 reply. I would not have said it better. I can also add that I went through a " stressful " period while converting, when my father passed away. Being able to rely on my jewish beliefs was an important part of my mourning process.