Religion give believers many reasons to be optimistic about their life: Eternal life in heaven. Blessings coming from God. Ask in prayer to receive what you need. Know that someone is watching over you at all times. God listens to you.
The great feeling of optimism is one reason our parents, friends, and politicians want religion for us. Freedom from religion does not have to take away optimism. Replacing the dream of eternal life in heaven is difficult, but life here on earth is so great that helping people enjoy their life now will give them a feeling of optimism and excitement religion does not do.