I for one would like to know, where in the Qur'an is the method to offer namaz is given? If not why not? Does it makes sense to claim that Allah says He left nothing out of the Qur'an and completed His Deen for mankind but we don't find method of offering namaz in it? We love to claim that whatever Allah willed to reveal is in The Final Revelation. Well, someone may ask, "Is that so? Where is namaz method?". We find a method to wash up before namaaz and what to do in absence of water, but no method to offer it??? The call to prayer, the prayer of the day of congregation, the bowing, the prostating is there, but still no details!!
This has me puzzled for a long time with no definitve answers.