Of course people can be happy without religion. This is because, as one psychologist said, happiness is “the experience of joy, contentment, or positive well-being,
combined with a sense that one’s life is good, meaningful, and
worthwhile.”
This being the case, any person who works to help others in some meaningful way, regardless of that person's religious views (or lack there of) has the opportunity to be genuinely happy. Conversely, self-centered and selfish people are almost always unhappy regardless of that person's religious devotions, because its all about themselves.
Sadly in our Organization, the Governing Body has long focused on people performing visible religious acts for salvation that often becomes as dry and meaningless as those who use rosary beads to say their many prayers to God. Whereas the path to happiness can often be found when a person starts to cultivate, what we would call the fruits of the spirit. Qualities such as love, joy, peace and long-suffering; qualities that can be grown independent of the Kingdom Hall ... as shown the the thousands of police, firemen, doctors and nurses who dedicate their lives to help strangers in trouble and who receive the reward of contentment when they have the opportunity to do some good.
no zombie