To some it seems to be, but not necessarily for everyone. I am an atheist and am quite happy with my life as it is. But others need that "comfort zone" of God to make it part of their harmony in life. So it varies from person to person.
For some people, yes. To a true believer life would seem pretty pointless without a god. Even so, while a lot of Christians (since we live in Christian countries) are happy, cheerful people, a lot are miserable, unhappy types. You know who they are in your life, there are plenty around. For them I doubt that their god has brought them happiness.
People like that would have no trouble with Swinburne's comment: "Thou hast conquered, oh pale Galilean; The world hath grown grey with thy breath."
Me? I'm a cheerful non-believer and can face anything life throws at me with confidence.