This has to be the most hilarious piece coming from Sam Shamoun. In fact it is so silly that once a Christian, trying to defend Shamoun, claimed that Sam Shamoun was deliberately trying to be funny and that this was some sort of humor which actually nobody understands. This is one way of attempting to save embarrassment but doesn’t really work. May be some other excuse like being drunk would have been more believable.
In the Qur’an, we find the following command:
… So believe in Allah and His messengers, and say not “Three” – Cease! (it is) better for you! … S. 4:171 Pickthall
The Qur’an is very clear: People should believe in Allah and His messengers and not say the word “three.” More specifically, they should not say the Arabic word for three.
On the other hand, Muslims are expected to recite the Qur’an in Arabic. Traditionally, at least during Ramadan, the complete Qur’an is recited in most mosques. That is impossible to do without also reciting the word for three in this verse (and plenty of other verses as well, cf. S. 2:196, 228, 3:41, 4:3, 19:10, 24:58, 56:7, 77:30, etc.).
In a nutshell: It is impossible to recite S. 4:171 without being disobedient to the command it contains.
This must be the shortest contradiction or logical problem contained in the Qur’an.
The first thing that strikes a reader are the three dots before the start of the verse. If such a method of looking for contradictions and logical problems is adopted, then surely one would find endless amount of errors. This argument basically sets the first rule to attack Qur’an i.e. quote out of context.
The full verse reads as follows. Pondering over the emphasized part would bring one to the conclusion that the Qur’an mentions the truth which Sam Shamoun’s article has proven.
O followers of the Book! do not exceed the limits in your religion, and do not speak (lies) against Allah, but (speak) the truth; the Messiah, Isa son of Marium is only an apostle of Allah and His Word which He communicated to Marium and a spirit from Him; believe therefore in Allah and His apostles, and say not, Three (i.e. desist from trinity). Desist, it is better for you; Allah is only one God; far be It from His glory that He should have a son, whatever is in the heavens and whatever is in the earth is His, and Allah is sufficient for a Protector.
 Qur’an 4:171