Yep, Quran plagiarized Bible a lot.
As for “pecularities” of Islam see my post #59.
Orthodox clergy are among the biggest critics of Islam. It seems like Catholic Pope is in disagreement with them and so are many Protestants.
Killing apostates is certainly not a founding principle of any Abrahamic religion Islam included.
Last I checked Vsevolod Chaplin is a ROC clergy, even an Archpriest, and he is supporting Islamic banking system in Russia
https://www.novayagazeta.ru/articles/2016/01/26/67183-171-my-znaem-chto-dumaet-bog-187
Killing apostates is certainly not a founding principle of any Abrahamic religion Islam included.
Now you are changing the definitions. I would go so far as to say that one of the original principles for the Islamic system is to get rid of their apostates/deserters.
For instance even today Saudi Arabia has criminal statutes making it illegal for a Muslim to change religion or to renounce Islam, which is defined as apostasy and punishable by death. KSA is not alone: Afghanistan, Iran, Malaysia, Maldives, Mauritania, Nigeria, Qatar, Somalia, Sudan, United Arab Emirates, Yemen all have the same law.
In at least a further 7 countries, apostasy is punishable with a prison sentence: Bahrain, Brunei Darussalam, Comoros, Gambia, Iraq, Kuwait, Oman.
https://humanists.international/get-involved/resources/the-right-to-apostasy-in-the-world/
The Hadiths are a big part of Islam and they show killing apostates is what should be done SEE:
https://www.bing.com/search?q=punishment+for+apostasy+in+islam&FORM=QSRE1
Bukhari’s Hadith Collection
Bukhari, volume 9, #17
"Narrated Abdullah: Allah's Messenger said, "The blood of a Muslim who confesses that none has the right to be worshipped but Allah and that I am His Messenger, cannot be shed except in three cases: in Qisas (equality in punishment) for murder, a married person who commits illegal sexual intercourse and the one who reverts from Islam (Apostate) and leaves the Muslims."
Bukhari, volume 9, #57
Narrated Ikrima, "Some atheists were brought to Ali and he burnt them. The news of this event, reached Ibn Abbas who said, "If I had been in his place, I would not have burnt them, as Allah's messenger forbade it, saying, "Do not punish anybody with Allah's punishment (fire)." I would have killed them according to the statement of Allah's Messenger, "Whoever changed his Islamic religion, then kill him."
Bukhari, volume 9, #58
Narrated Abu Burda, "Abu Musa said.....Behold there was a fettered man beside Abu Musa. Muadh asked, "Who is this (man)?" Abu Musa said, "He was a Jew and became a Muslim and then reverted back to Judaism." Then Abu Musa requested Muadh to sit down but Muadh said, "I will not sit down till he has been killed. This is the judgment of Allah and his messenger," and repeated it thrice. Then Abu Musa ordered that the man be killed, and he was killed. Abu Musa added, "Then we discussed the night prayers .....