Bismillah
as salam alykom
Before Insh a Allah I continue on explaining the Ayahs that usually cause confusion on the side of non Muslims or even Muslims, I need to touch on a crucial Ayah that non Muslims twist to attack the authenticity of Quran.
"Have you then considered (the idols of the pagan Arabs:) Al-Lat, and Al-'Uzza* And Manat (another idol of the pagan Arabs), the other third?" (Quran 53:19-20)
In this Ayah, Allah Is bringing the names of the three main idols highly respected by the pagans at that time. This Surat (Annajm) was the first Surah to revealed (a Meccan Surat) containing a position of Sajda (prostration) in quran which comes at the end of the Surah:
"So fall you down in prostration to Allah, and worship Him (Alone)."
When the Messenger salla Allah a`lyhee wa sallam recited this surat while praying at Ka`ba, a number of pagans where standing behind him listening in complete awe. They were so much taken by the words of Quran, carefully listening with full respect, that by the time the position where one who recites must follow the Command of Allah and Prostrates came, the Messenger salla Allah a`lyhee wa sallam went down immediately. The group of pagans who were listening followed without thinking and prostrated as well.
Later on, they received much blame and criticism from their peers. In order to verify their action and not be accused that they were deeply affected by Quran, they lied,claimed, alleged and said that Mohamed salla Allah a`lyhee wa sallam praised their idols after mentioning their names through a verse in Quran. But one who reads the Surat does not of course find such praise (waliyadhubillah). This incident was somehow misinterpreted as that waliyadhubillah satan was able to throw this part to the Messenger salla Allah a`lyhee wa sallam who just repeated it but then Allah abrogated this part and took it off.
However, the situation is just as explained above. Such verses were not even included. It was just a way out the group of pagans used to verify their prostration after the Messenger salla Allah a`lyhee wa sallam
Alhamdulelah
wa Allahu a`lam