Not necessarily but it does help. Jesus had several definitions for happiness, such as found at Matthew 5:3 - “Happy are those conscious of their spiritual need, since the Kingdom of the heavens belongs to them."
Building a strong relationship with Jehovah is a vital part of finding lasting happiness. Unlike animals, we have an innate need to understand the meaning and purpose of life. Only Jehovah God can fill that need, and he does so through his Word, the Bible which reveals God’s purpose for the earth. It tells us why we are here, why there is so much suffering, and what God expects of us. Understanding such Scriptural truths is essential to our living a meaningful and satisfying life.