Why is Jesus being God important for Christians?

The divinity of Jesus is fundamental to the Christian faith, as it confirms His capability to mediate between God and humanity. As the God-man, He fulfills the law, taking upon Himself the sins of His people and providing a perfect righteousness. Without His divine nature, His atoning sacrifice would lack the power to justify and reconcile us to God. Furthermore, recognizing Jesus as God assures us of the efficacy of His work; only the divine could bear the wrath due to mankind and secure eternal life. Thus, the belief in Jesus' deity strengthens the believer's hope and assurance of salvation, solidifying their trust in His promises.