To clarify I am Atheist but this topic has confused me because both groups are denominations of Christianity.
1) From my understanding Protestants don't consider Catholics Christian they just are Catholics.
a) One of the reasons being they worship Mary kind of like God which is like worshiping a false prophet.
[b]So why do Protestants not consider Catholics Christian?[/b]
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Christian; A Christian is a person who adheres to Christianity, an Abrahamic religion based on the life and teachings of Jesus of Nazareth. "Christian" derives from the Koine Greek word Christ, a translation of the Biblical Hebrew term mashiach. There are diverse interpretations of Christianity which sometimes conflict. However, "Whatever else they might disagree about, Christians are at least united in believing that Jesus has a unique significance.” By this definition, Catholics are definitely Christian. There might be a lot of squabbling about how to please their god, but the central defining theme is that they follow Christ's teachings to some degree.