The essence of Christianity is centered upon the Lord Jesus Christ. The sum and substance of being a Christian is trusting Christ with the entirety of one's being. The height of the Christian life is adoring Christ, the depth of it loving Him, the breadth of it obeying Him, and the length of it following Him. Everything in the Christian life revolves around Jesus Christ. Simply put, Christianity is Christ.
Steven J. Lawson (2013). “The Kind of Preaching God Blesses”, p.57, Harvest House Publishers