Dr. Peter Kreeft outlines the importance of, and the reasons for, believing in the divinity of Christ:

The doctrine of Christ’s divinity is the central Christian doctrine, for it is like a skeleton key that opens all the others. Christians have not independently reasoned out and tested each of the teachings of Christ received via Bible and Church, but believe them all on his authority. For if Christ is divine, He can be trusted to be infallible in everything He said, even hard things like exalting suffering and poverty, forbidding divorce, giving his Church the authority to teach and forgive sins in his name, warning about hell (very often and very seriously), instituting the scandalous sacrament of eating his flesh—we often forget how many “hard sayings” he taught!