[Dewy]

"Protestant Churches do not have those four marks of the Church as Catholics do. "

Why don't we? The word Catholic means universal church. All Christians make up that universal church. At this present time the church is on earth and is local, will not be together until our King Jesus returns for us.

The church is not a organization it is a organism.
Some look to their organizations for salvation, Christians look to Christ.

[Cronos]

All Christians make up that universal church.

Not all those who use the label "Protestant" or "Evangelical" or "Pentecostal" or "inter/non-denominational" are Christians.

Unitarians and Mormons are some extreme examples, but there are many la-di-dah groups that are not Christian. Most people who's teachings do not follow the Apostolic Church (i.e. the teachings from the Assyrian, Armenian, Coptic, Syrian, Eastern Orthodox, Chaldean Catholic, Maronite Catholic, Roman / Latin Catholic, Syrian Catholic etc. Churchs) are not Christian in the true sense as their beliefs are not Christian. There are many groups that take the Bible as a Holy Book but are not Christian -- the Mormons and Muslimes for example