That is probably because it isn't exactly true. The Church is visible, and only those who are visibly united with the Church are called Catholic. I believe this is covered in Pope Pius XII's encyclical Mystici Corporis. I know what you mean though, and it is true that all who are Baptised are part of the Mystical Body, but while on earth, membership in the Mystical Body and membership in the Church are not identicial, even though it is true that the Church herself is the Mystical Body. For instance, a Catholic guilty of Mortal Sin is no longer a living member of the Mystical Body, but remains a member of the Church.
That's where we disagreed at CA. I think the Church Universal (Catholic) consists of all the baptized. The person at CA thought it only consisted of those in full communion with the Pope.
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