You determine everything pretty much about your life (to an extent). You can attract negativity or positivity towards you, so its always important to stay as optimistic and positive as possible. Sometimes, that may seem hard but really it pays off big time in the long run, i have been able to somewhat master this concept and can say it does work wonders.
No one should wait on a person, book, religion, science or whatever to show them happiness or prove a way of life is better or happier than another. To each their own with experiences, and the person that think's God will take care of all their sorrows is no more right or wrong than the individual who is convinced God doesn't even exist. Though i personally think it all goes hand in hand, everyones perceived reality is a piece of our true reality and its never a right or wrong thing. Thinking unicorns may exist isn't a stupid belief, because in some way or another they do exist because we have created them with either thought or by experience of having seen or been around them. They have a place in our world despite not physically having been apart of it (to our knowledge)
Don't ever ever ever ever ever judge someone! This is such a huge no no, whether or not you believe you are right..and you may be...doesn't mean someone else has to agree and because they don't agree doesn't make them wrong. We are driven by our ego and our desire to think what we believe to be true is the only way of life but that couldn't be farther from the truth. We need to accept that there can be things we do not understand and it may be better for some individuals to not understand it but jus accept that it is as is. Do not ever judge someone unless if you have walked a mile in their shoes! (which is impossible, because we can only go through life with our own perception and view of reality. We can though, learn to try to understand where others come from...which really isn't that hard)