Catholics are Christians?

Yup. What makes us Christians is the belief in the deity of Jesus Christ, in the Holy Trinity. Catholics are Christians, the Orthodox and most Protestant denominations. Jehovah's Witnesses are not Christians, who reject the deity of Jesus.
On this subject most Christians think differently. If you ask any Protestant the evangelical, of any denomination, will have to object by saying that Catholics are pagans because they venerate the statues and address their prayers to the Saints and the Madonna. E’ true that they break the first commandments, but it is not up to us to judge, it will be God on the day of judgment to do it. They still believe in Jesus Christ as Savior. After all, this is what makes us Christians, believe that Jesus is God, believe in the Trinity.
If we ask the Catholics, instead, whether Protestants are Christians, they will have no doubts about answering in the affirmative, but they will add that they are”separated” as outside the true and only Church of Christ. So they question salvation. They attribute salvation not so much to being followers of Christ, but to the visible Church, to belong to it, to the Roman Catholic Church. This is not the case, the Bible doesn't say that, and the early Christians did not have a visible united church with a Pope at the head, but it was organized in many different and autonomous communities. All these independent communities formed the Body of Christ, that is, the invisible church of Christ. And so it is today. We would perhaps doubt that they had drifted because they were not yet part of that powerful institution which was formed centuries to come.?