Mohammad says, "War is deceit." (Sunnah Vol 4, Book 52, Number 269; The Sunnah, or Sahih Bukhari, is a collection of purported sayings and deeds of Mo, written about 200 years after his death, but regarded by Muslims as a sacred and perfect text.)
Islam is a religion of world conquest over all non-Muslims, via military means which include lying to un-conquered non-Muslims. This concept has a formal name, Al-Taqiyah, and can take many forms.
The most famous example of Al-Taqiyah appears in the Koran, where Mo and his original band of Muslims confront Mecca, and agree a treaty that bans military hostilities for ten years, in exchange for the Meccans permitting the Muslims to enter annually to engage in the pagan pilgrimage to Mecca's shrine to the moon god, "Allah". At the time, Mo's army was only about 1,500, and Mo didn't believe that it could conquer the Meccan army. So Mo honored the treaty just long enough to build his army to over 10,000. At that time he felt he could conquer the Meccans, and he discarded the treaty, conquered Mecca, and subjected its people. This subjugation included the execution of the comedian/poets who had previously ridiculed him for claiming to be the new King of the Jews, etc.
Of course Mo's Islamic army is not the first or last to lie to their adversaries in order to buy time for a future conquest. Hitler famously did this, as did the eventual US Confederates, and the US military made many treaties with American Indians which they always broke. However, only Islam amongst religions condones (even commands!) such behavior as a requirement for its adherents.
This frightens me. When people advertising themselves as Muslims, who both proclaim their actions all as deriving from Islam and the eventual defeat of non-muslim secular democracies, sign treaties with these non-Muslim democracies, I have serious doubts.