Using your logic Santo, nearly all non-Catholics go to Heaven because they're practicing what THEY believe to be true. But it does not work that way, it isn't about what you think is true. Either you accept God and His Church or you aren't saved, simple as that. The only way an atheist could be saved is if he either repented or never even heard of God and has no one to teach Him of God (like the people in countries such as Africa, although I'm not sure they would be called atheists per se). There is no salvation outside the Catholic Church.