Why is it important for Christians to believe God is their God?

Believing that God is their God gives Christians immense assurance and comfort. As noted in Psalm 121, 'The Lord is your keeper; the Lord is your shade on your right hand,' underscoring that God actively protects and guides His people through life's challenges. This belief instills confidence in His sovereignty, as it is based on the understanding that God's attributes work for the welfare of His people. It also shapes the believer’s identity as part of God's elect, called to serve Him from a place of security and love, encouraging a life of worship and obedience in response to His grace.