Christian schisming is a 2000 year old sport. And they've been accusing each other of not really being Christians for just as long. So this kind of controversy doesn't surprise me any. But looking at history, it's absurd to suggest that Catholics aren't Christian. If that's the conclusion you reach, then unless you think Orthodox Christians are Christian (I do, but I suspect those who exclude the Catholics would exclude them too), you are left with the claim that Christianity started in the first century AD, disappeared in the 300s and reappeared 1200 years later in the 1500s.
If there is a god, I want to believe that there is a god. If there is not a god, I want to believe that there is no god.
