The Roman Catholic Church is just as much a man made denomination as any other. It was not started by God. The Church started by Jesus is the church made up of the body of believers redeemed by Christ that have washed their robes in His Blood Undoubtedly there are some Catholics and Protestants in that Body. But the Roman Catholic Church was neither started by Christ nor holds a monopoly on Truth.
I respectfully disagree with your assertion, but as I had noted, our religions, and hence our beliefs, are very different from each other.