Because Yahweh created man, and through biblical history revealed Himself to man in various ways, the most important being through His Son Jesus Christ. The "need" you referred to in your question is a natural, God-given part of our makeup, but it has been tainted and marred due tou our inherent sinfulness. God, since the Fall of man has been at work redeeming mankind and His creation back to Himself. Next in His timeline is the Second Coming of Christ, which is imminent.