Why obedience to the prophets, who needs them anyway?

In answer to the video "Muhammad did it. Therefore it is not sinful."

It is normal for someone coming from a Judeo-Christian background to question the idea of unconditional obedience to the prophets. It is in fact expected that someone whose tradition depicts its prophets, religious leaders and eminent personalities in the worst possible manner to be suspicious of these supposedly righteous men of God. Anyone familiar with these man-made scriptures shouldnt be surprised at seeing sins like idolatry, adultery, murder and the like being attributed to the Biblical prophets.

It is a common theme in the Bible that the many divine chastisements that befell the Israelites were due to sins which they were mislead into commiting by their own prophets, leaders, kings. This is besides the rampant tribal prejudice running allthrought their history, the puerile villification of characters and the internal conflicts.

 Here it should be quickly worthwile mentioning the tribal tension surrounding the Davidic line. After Solomon's death, his kingdom was divided, allegedly as a divine punishement for his sins, including the sin of idolatry which eventually dragged the entire nation. We see here how the divine justice plays out, punishing others for someone else's crime. Most certainly, far from that noble prophet being the instigator of this greatest sin and the cause of its re-introduction into the Israelites' lives, this yet again confirms the nation's constant and stubborn ingratitude. Moses had foreseen their turning away from the straight path into the sin of idolatry. Virtually all prophets that followed him kept on condemning them for that constant fall out into the ways of the pagan nations.

This lack of faith resulted in them majoritarily defecting from the house of David and the divine covenant itself. The nation sceeded in 2; the kingdom of Israel to the north with Samaria for capital and the rebellious and polytheist Jeroboam as its king, and the tiny kingdom of Judah, comprised of the tribes of Judah, Benjamin and Levi, who had remained faithful to David and Solomon's royal line, with Jerusalem as capital to the south and Solomon's son Rehoboam as king

Hos12:1"Ephraim has surrounded me with lies, and the house of Israel with deceit, but Judah still rules with God, and with the Holy One he is faithful". 

Both kingdoms remained at war with one another throughout their respective leaders' reigns.
It certainly isnt difficult to imagine how this inter tribal hatred can result in the kind of insiduous accusations as David, Solomon and other prophets were victims of. The Hebrew Bible is literaly filled with such examples.

Lot whom Judaism does not consider a prophet but was certainly among the most God-fearing in his nation, had incest with his daughters who begat his children Gen19:30. Yet this only righteous man among his decadent and sinful people was just extracted from a nation destroyed because of sex related crimes. What is more intriguing is that according to the Hebrew text, once his eldest daughter got him drunk and finished the sexual act with him, he realized what had happened but nevertheless got drunk again the same night and had incest with his second daughter. That is besides the issue of God not preventing the misdeed of those He had just saved. He could have simply told them that there were other men in the town of Zoar they had just reached. The reason given by the scribes that the daughters worried about the extinction of the human race, thinking no men were left upon the earth, is further discredited considering the simple fact that they certainly interracted with the people of Zoar to get the alcohol that got their father drunk with, or the nearby settlement of Abraham Gen19:28. 

Regardless, this surreal tale has the 2 daughters eventually begetting 2 boys, Moab, and Ben-ammi. Moab is the ancestor of the Moabites and Ben-ammi the father of the Ammonites who just so happen to be the competing kingdoms to the west of Judah. Thus is explained the origin and inferiority of non-Jewish neighbours. Thats another instance in the HB where the sins of others explain God's disapproval, cursing or punishing of others. Instead of being Abrahamic tribes and thus equally entitled to the land as the Israelites, the Moabites and Ammonites became foreign invaders with no rights to the land. That the whole tale is a retrospective account aimed at portraying negatively a certain people, is seen from the anachronism of having Moabites or Ammonites in the patriarchal period, while there were none.

As to David, the great prophet, he brings Batsheba to him and has sex with her after he saw her bathing from his roof top. But he had first to plot for her husband's murder 2Sam11. This is because once the woman got pregnant through this sin punishable by death Lev20:10, David could not get her brave husband, Uriah, to leave the battlefront and have him sleep with his wife to hide the sin.. The brave soldier refused the comfort of his home while his commander was at the battlefield. David tried getting him drunk and leave the warfront but he still refused. Time was running out and the sin was going to become apparent. David then arranged for Uriah to be put at the front line  where the fighting was fiercest, then have the army retreat and let him be killed. The plan succeeded and Batsheba became David's wife.

In the Quran on the other hand, in sura Saad/38 David is given ghafr/covering/protection in authority and judgement. He is reminded of his eminent status in the world as well as the qualities expected from one who has been drawn near to God; wisdom in judgement between men, steadfastness in God's way and rejection of all falsehood, whether coming from inside or outside one's self. The slanderous scribes of the Bible however still found a way to disparage him and his household despite his lofty character, blindly passing off his enemies' malicious talk as facts, probably even contributing to it. The death of Batsheba's husband and subsequent marriage to David was too much of a coincidence for their lowly mentality and thus accused David of adultery and murder. They constantly needed to shift the blame for their own sins and subsequent destructions, on their leaders' "misguidance".

The true God does not let the names of his noble servants, the prophets and their households to be dishonored in this manner

24:23-5"Surely those who accuse chaste believing women, unaware (of the evil), are cursed in this world and the hereafter, and they shall have a grievous chastisement. On the day when their tongues and their hands and their feet shall bear witness against them as to what they did. On that day Allah will pay back to them in full their just reward, and they shall know that Allah is the evident Truth".

Despite reproaching him of his evil act through the prophet Nathan Ps51, the divine biblical justice played out, not by punishing David himself who had commited the sin but by promising bloodshed within his household, which almost resulted in civil war and even the destrucion of all his followers 2Sam19, the hatred and attempted overturn of his rule coming from among his own sons. Sure David the sinner was at one point forced to flee Jerusalem during the revolt of one of his sons Absalom and the social chaos his father's sin had created. But what is it compared to having his wives taken from him and lying with others in front of all of Israel like worhtless prostitutes 2Sam12?

Solomon broke God's covenant, and at the instigation of his hundreds of foreign polytheistic wives (700) and concubines (300)

1Kings11"went after Ashtoreth, the goddess of the Zidonians and after Milcom the abomination of the Ammonites. And Solomon did what was displeasing to the Lord, and he was not completely devoted to the Lord as was David his father. Then did Solomon build a high place for Chemosh, the abomination of Moab on the mountain that is before Jerusalem and for Molech, the abomination of the children of Ammon".

His multiple marriages were also a transgression of the Torah Deut17:17,Neh13:26. Contrary to the lowly depiction that is made of him by the scribes of the Bible, instead of his posessions and power leading him to excess and sin, the Quran depicts him as increasing in gratitude and never faltering from God's remembrance despite these favors

38:30"And to David We gave, Solomon. Excellent was the servant; indeed, he was (always) returning (to Allah)".

Noah was a drunkard who laid naked in his intoxication Gen9:18-25 and the talmudic scholars assert that he was either castrated or sodomized (they're not really sure which of the two) by his 4th son Cham/Ham while unconscious (Rashi; Sanhedrin 70a). These are the descriptions they give of a man whom they traditionaly do not view as a prophet yet he not only received comunications from God, but was also one whom the Torah says was

Gen6:9"a righteous man he was perfect in his generations; Noah walked with God".

Their tradition also contradictorily speaks of him having had in possession the staff of Adam, that would later be owned by Moses, which only the righteous may manipulate.
Still in the Talmudic accounts, as a result of not being able to have more children, Noah cursed Cham's innocent 4th child (Canaan), turning him black and exiling him to Africa, thereafter condemning Cham and his descendants to be his brethren's slaves. This apparently seems to be the justification for black slavery. Still among the list of Talmudic "anecdotes", Ham's descendants would be led out of Egyptian captivity "with bare buttocks" as a retribution because of Ham who saw his father’s nakedness and did not cover it Isa20:4.