Nope. The RCC came into existence around the 300s. The NT Church did not witness the worship of Mary, a pope, indulgences, etc.
All devout Catholics are certainly Christians.
Again not true. Devout Roman Catholics are....devout Roman Catholics.
How can you say that Christs mother has nothing to do with Christianity?
Not what I said.
The attributes, prayers to and reliance upon Mary for salvation as found in Roman Catholic writings has nothing to do with Christianity.
Phony history underlies your phony arguments.