"Christ, be the center of our life, of our world, or our church."
This song, and others like it, exhort members of the Body of Christ to make Christ Jesus the center of their lives.
Jesus Christ is at the center of the Universe:
"Who is the image of the invisible God, the firstborn of every creature: (Colossians 1: 15)
He represents God the Father to all of us ("He who has seen me has seen the Father"
(John 14: 9)
"For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:" (Colossians 1: 16)
"And he is before all things, and by him all things consist." (v. 17)
Jesus is "before", which indicates that He takes preference above all things.
"And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence." (v. 18)
Jesus is the head of the Church, or otherwise there would be no church.
"19For it pleased the Father that in him should all fulness dwell; 20And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven." (V. 19-20)
Everything that we need, we find in Jesus, for He is the "fulness" of all things. Because of Jesus' death and resurrection, God has reconciled the world to Himself, but every person must "believe" in Him (John 6: 29)
We do not put Jesus in the Center, for He is already there. We are called rather to "believe" that He is there, that we grow in grace and knowledge of Him at the center of all things, and allow Him to be first.