ON THE QUALIFICATIONS OF MUHAMMAD AS A PROPHET

God gave Moses 10 Commandments.  The seventh commandment said…

“Thou Shalt not Commit Adultery”

Here is a list of many in the Bible whom Islam says were prophets and their behavior concerning the question of adultery (Muslims may pronounce the names differently or ascribe different names to them).

Adam had one wife.

Seth had one wife.

Enoch had one wife.

Noah had one wife.

Abraham had 3 wives.

              He had a second wife because his first wife couldn’t have children.

              When his first wife did miraculously have a child (Isaac), he sent his first wife away.

              He had a third wife only after his first wife died.

Isaac had one wife

Jacob had four wives only because he’d been tricked by his father-in-law.

David had many wives.

              And although the New Testament says he was a prophet by virtue of the fact that he gave prophetic utterances, his office was                 that of a king. He was not above the law of Moses, and therefore, a prophet chastised him for his adultery.

              Because of his adultery one of his sons temporarily took the kingdom from him, he was

   humiliated in front of  everyone in his kingdom, and his household was divided the rest of his life.

Solomon had many wives

              But he also was not a prophet.  He was a king and because of his adultery his kingdom was divided and all of its wealth was
              lost.

Muhammad (solely a prophet of Islam) had several wives and the Quran was claimed to have justified it. In Surah 33:50 we read.

O Prophet, indeed We have made lawful to you your wives to whom you have given their due compensation and those your right hand possesses from what Allah has returned to you [of captives] and the daughters of your paternal uncles and the daughters of your paternal aunts and the daughters of your maternal uncles and the daughters of your maternal aunts who emigrated with you and a believing woman if she gives herself to the Prophet [and] if the Prophet wishes to marry her, [this is] only for you, excluding the [other] believers. We certainly know what We have made obligatory upon them concerning their wives and those their right hands possess, [but this is for you] in order that there will be upon you no discomfort. And ever is Allah Forgiving and Merciful.

Surah 33:50

Muhammad married the divorced wife of his adopted son.  His feelings for her were there before she’d ever been divorced. Yet somehow, Allah justified this for him and allegedly gave her to him.  If you're Arabic speaking, you can read about it here.

And [remember, O Muhammad], when you said to the one on whom Allah bestowed favor and you bestowed favor, "Keep your wife and fear Allah ," while you concealed within yourself that which Allah is to disclose. And you feared the people, while Allah has more right that you fear Him. So when Zayd had no longer any need for her, We married her to you in order that there not be upon the believers any discomfort concerning the wives of their adopted sons when they no longer have need of them. And ever is the command of Allah accomplished

Surah 33:37

Even Aisha whose marriage to Muhammad was consummated when she was at the age of 9 pondered the reality that Muhammad managed to get "convenient" revelations from allah justifying his acquisition of a harem.  Of course her testimony doesn’t count because Islam has declared that the testimony of a woman does not bear the same weight as a man. 

You can read about this pondering on her part here.

'A'isha (Allah be pleased with her) reported: I felt jealous of the women who offered themselves to Allah's Messenger (Peace be upon him) and said: Then when Allah, the Exalted and Glorious, revealed this:" You may defer any one of them you wish, and take to yourself any you wish;
and if you desire any you have set aside (no sin is chargeable to you)" (xxxiii. 51), I ('A'isha.) said: It seems to me that your Lord hastens to satisfy your desire.

Sahih Muslim 8 3453

CONCLUSION:

Absolutely no individual who both the Bible and Islam agree were prophets had adulterous relationships which would have compromised their proclamations concerning the moral demands of God.  Furthermore, God never condoned adultery.  This is confirmed by the consequences resulting from the adulterous practices of kings.

Muhammad practiced adultery and used the Quran to create the perception that activities which constituted adultery (e.g. The taking of multiple wives, the taking of underage children for wives, the marriage to divorced women) were not, in fact, adultery but, on the contrary, were permitted by God.  By doing so he has led tens of millions of followers astray using the name of allah to justify a practice that God never permitted. And dare I say, God's standards of morality never have changed and never will change no matter who might declare otherwise.

Muhammad’s behavior vastly differs from the behavior of any of the prophets of the Bible.  By that virtue alone, he does not qualify as a prophet.  Evidence would have it that Muhammad used allah and the Quran to justify his own lusts and in so doing, he redefined God's standard of morality which objectively speaking, will not and cannot change in spite of what Muhammad "legitimized".  Rather than leading people towards God which is the role of a prophet, in the name of allah, Muhammad led people... countless numbers of people, away from God.  In light of that alone, Muhammad is neither a prophet, nor is his Quran a genuine "holy book".