His plan for us is that we find fullness of life in Him. John 10:10. That is, that we truly live because of what He's done. His glory, is seen in a person living fully alive.
Further, He has designed us such that we find Him not only on an individual level but in the way visits a community of believers. It's through relationships geared around our understanding of God that we discover more of Him and encounter His life in our life more fully.
Without other people, we experience a deficit of what we could know of God, for it's when we mix our faith in relationship with others that He shows us more and more of Himself and visits us afresh.
So He created church. Come experience Him with us!