score:6
I'm addressing all of the inquisitions, not merely the Spanish Inquisition here. Several were perpetrated by kings, not the Catholic Church.
I agree with the other answers that state that the Inquisition is a stain and an evil that should never have happened. None of what I'm posting here should be taken in any way that detracts from @James Black's answer, or @Apocatastasis. I'm merely listing some impacts not listed in their answers.
Impacts include:
Also, if my understanding of the history and timelines is correct, then at least some of the Inquisitions happened before or during the Protestant Reformation.
Since the Reformation was as much about rebelling against abuses by the Church (See several of the points, including but not limited to #10, 24, 27... here) as it was about differences in doctrine, you might be able to argue that the widespread existence of protestant denominations is at least partially due to the Inquisition. Certainly, Church-sponsored torture and murder of those who simply believe differently are examples of corruption and abuse of power. If not a direct cause, the Inquisitions certainly would have added fuel to the fire.
Upvote:1
Understanding the Inquisition only in the Christianity (or Spanish context) is a biased and reduced conception.
Nowadays, when the concept of laicism has evolved sufficent to create a neat distinction between religious identity and national membership in Western societies, the Inquisition is seen as a mounstruosity, but in old ages that distiction was more diffuse. Religous identity was important enough to determine national loyalty. Heresy was also a betrayal to the nation.
Also, prosecution for religious disense was not privative of Spain. We must remember the execution of Miguel Servet by French Calvinists. Muslims had a similar mechanism too.
Another important fact is the gross exaggeration of the Inquisition victims. Only by the reigns of Henry VIII and Elizabeth I in England had more Catholics died than heretics were burned by the Spanish Inquisition in its whole existence. Torture wasn't invented by the Church: it existed before she and was used ordinarily by civil powers to get "the truth". In fact, Inquisition courts were the first to supress torture in their processes. The jails of the Inquisition were better than the civil ones too.
In summary: brutality and violence were an epochal characteristic and not a consecuence of Inquisition. Those methods were somoothed gradually precisely thanks to Christianism.
Upvote:4
The impact on the Spanish Inquisition on Christianity is more of an example when people use religion as a way to gain more political power. Unfortunately we see this same behavior, the justification of following God's will in various parts of the world, such as the problems in Nigeria and the atrocities in the Sudan.
When leaders, or political activists seek to gain power, and the ministers provide the religious backing, by stating this is God's will, then we have abuses such as in Guantanamo prisons, as American's torture and denigrate people of other religions.
But we also have some people in Europe and the US that continue to talk about killing Muslims because of their religion, when the goal is financial gain, under the cover of religion.
So, the Spanish Inquisition was a very dark period, and should never have happened, but as long as Christians idly stand by and don't stand up for those that believe differently, showing God's Love to the world by our willingness to die for those that may hate us, or those that are different than we are, we are all guilty of the atrocities committed, and even listening to ministers espouse such hatred, and saying nothing is just as bad as doing the action, as words not only damage our relationships with others, but also what we say, or listen to and say nothing, reflects on whether Christ is truly within us.
For a brief talk about the politics behind the Inquisition:
http://www.worldfuturefund.org/wffmaster/Reading/Religion/inquisition.htm
For an essay on Words healing or hurting: http://www.orthodoxytoday.org/view/words-can-heal-or-hurt
Here are a couple of quotes on what we say:
18Whoever hides hatred has lying lips, And whoever spreads slander is a fool. 19In the multitude of words sin is not lacking, But he who restrains his lips is wise.
Set a guard, O Lord, over my mouth; Keep watch over the door of my lips.