Catholics ARE Christians. An attack on Catholics is in fact an assault on all Christians.
You wrote: “Inquisition is one of the darkest Chapters in history of Roman Catolic Church, not Christianity. Other Christian Churches have nothing to do with it. We should give due credit where the credit is due.”
The inquisition was not a dark chapter in the history of the Catholic Church. And the Catholic Faith IS Christianity. Also, Christian sects most definitely had things like the worst of the inquisition stereotypes: the Anglicans and English Reformed certainly hunted down and killed a large number of Catholics, the Scots and Lutherans certainly “tried” and executed large numbers of “witches” who were, in fact, completely innocent.
Protestants often simply dispensed with trials altogether and murdered their hated Catholic or non-conformist targets. At least the inquisition allowed you to name your enemies and their testimony would be discounted, and some inquisition tribunals allowed defense lawyers.
Only Catholic Spain, with its inquisition, managed to almost completely avoid the witch crazes of the 16th and 17th centuries. That is not an accident.