we humans have extracted the five major points of the Qur'an, however they pillars themselves are not inventions of humans because each pillar is from the Qur'an. Personally i don't see anything wrong with summarising the major points.
i don't agree totally. let's take fasting for instance - especially given it is the month of ramadan. yes, it is from the koran. search fasting and see how many verses you will find in the koran addressing fasting? God simply states fasting is enjoined as it was before and for what purpose. if it is too difficult then, you feed the needy. so is fasting really a major point or is being a righteous person?
the major point/theme is to believe in God, the last Day and to be a good person, doing good deeds, living a moral life. over and over again this is what God says in the koran. Sura 262 "surely those who believe, and those wo are Jews, and the Nazarenes, and the Sabians, whoever believes in God and the Last day and does good, they shall have their reward from their Lord, and there is no fear upon them, nor shall they grieve.
fasting is merely a means of achieving the goal.