The proof of the lack of Christ teaching in Catholicism is the lack of God's Word in the formation of its doctrine and organization.
How is Catholic doctrine and organization lacking Christ's teaching?
Considering that every other group of Christians has allowed contraception from the 1930’s on with the exception of the Catholic Church, you obviously are deficient in the reasoning department if you could overlook such a simple truth. We can also talk about the implosion that is occurring within the various other Christian groups leadership as well. Its not just isolated to the Catholic Church. It is worldwide and is endemic of the “ways of the world and men” not the ways of God.