How can we have fellowship with a holy God when we are sinful?

In order for sinful humans to have fellowship with a holy God, a transformation must occur. 1 John 1:6-7 teaches that while we are inherently sinful, we can walk in the light through the cleansing power of Christ's blood. When we place our faith in Him, God gives us a new heart that is capable of loving and following His ways, creating a holy nature within us. This new nature enables us to engage in harmonious fellowship with God, despite our sinfulness, because we are seen as righteous due to Christ's finished work. Thus, our relationship with God is based on grace through Christ, not on our own righteousness.