What I see, that gives ME faith, is that most people can learn to change, to grow, to forgive.
Some people stay stuck. and as long as WE, as individuals, can come to see that our existence, or purpose, is much more divine than just 'living', we can believe in some kind of divine intelligence that we are all part of. Be it 'god' or 'spirit' or 'The Force', it's still a part of who we are.
I've always found that when I try to 'fix' somebody, I become part of the problem. But when I become the 'leader' and move forward, they want to come along! When I set expectations on them and encourage them to live up to them, they do.
This only works when I don't have a fear that if I lose them, I will be broken. I won't. And neither will you.