The H's: Hitler, Himmler, Heydrich, Hoess ....
Plus types like Odilo Globocnik ('Odious Odilo'), Eichmann ...
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The actual killings were carried out mainly by the SS and the Einsatzgruppen (mobile killing units).
The Holocaust itself had no religion as it was not a person, but the perpetrators were Christian and the victims were Jews.
In general terms; they were the perpetrators.
Some of the perpetrators were put on trial, convicted and hanged. However, many changed their names, etc and 'lived happily ever after'.
the victims no one is trying to remember the perpetrators
'Involved' as victims or perpetrators?
Children were not involved as perpetrators, if that is what you mean.
Many groups fought, but if the Holocaust were to be split into two groups, they would be the victims and the perpetrators.
Please see the related question below.
The problem is whether the perpetrators are willing to recognize another holocaust as it is forming and occurring. For example, many people point out that the 50 million abortions (just in the U.S.) qualifies as another holocaust. But the perceived benefit (casual sex without responsibility) is so seductive and addictive that the perpetrators would not seriously consider its status as a holocaust.
If you mean the WWII holocaust, mainly Nazi Germany. There were other mass killings around that time: Japan in China, and Stalin in the Soviet Union.
Considering most of the world were bystanders to the Holocaust, this would excuse the actions of those who perpetrated the Holocaust and those who enabled it. So no, you cannot say that they were.
yes, they killed many people. However you can say that it failed as the perpetrators did not complete the job.