Can you point out where he is wrong?
The more important question is: Why do you believe a word he says? The only answer I can think of is that it fits your agenda to slander Evangelical Protestantism.
While the Roman Catholic Church might be a monolithic organization, it is just that: An organization. Nothing more. While Roman Catholics are united on the outside, true gospel believers, no matter what church they attend, are united as members of the body of Christ. And, that my FRiend, transcends denominational boundaries in a way that you do not seem to understand.