Sunan an-Nasa'i 3328--It was narrated from Aishah that Judamah bint Wahb told her that the Messenger of Allah said: "I was thinking of forbidding Ghilah until I remembered that it is done by the Persians and Romans"--(one of the narrators) Ishaq said: "(They) do that--and it does not harm their children."
Ghilah refers to having sex with a woman who is breastfeeding. Muhammad says that he was thinking of forbidding the practice. But then he remembered that the Persians and Romans do it, so he didn't forbid the practice. Apparently, if he hadn't remembered that the Persians and Romans practice Ghilah, he would have condemned it, and Muslims today would say that Allah forbids Ghilah.
Isn't it obvious that this had nothing to do with any divine insight on Muhammad's part, and that what he rejected and accepted was simply a matter of his all-too-human thought processes? If so, why are Muslims so obsessed with following Muhammad's regulations (especially when they include pagan practices, such as bowing to the Ka'ba, etc.)? Here Muslims will say, "We follow Muhammad's regulations because he commanded us to follow his regulations." But that's exactly my point. As this Hadith shows, Muhammad's reasoning had nothing to do with revelation. Why, then, accept his command to follow his regulations?