Mohammad married his first cousin, Zaynad bint Jahsh and he also allowed the marriage of his daughter, Fatima to his cousin Ali ibn Abi Talib.
This is just one of many proofs that islam is a lie. If allah was indeed the "intelligent designer" of the universe and everything in it including us he would know that close relatives have a higher than normal consanguinity which means an increased chance of sharing genes for recessive traits when procreating.
Muslims revere Mohammad, strive to emulate him and consider him to be the “perfect human”.
Muhammad was very explicit in rules to live life by in every way as prescribed to him by allah for all muslims yet yet he didn't prohibit inbreeding (and pedophilia) and in fact encouraged it by setting an example.
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Our companions have said that if the penile head has penetrated a woman's anus, or a man's anus, or an animal's vagina or its anusthen it is necessary to wash whether the one being penetrated is alive or dead, young or old, whether it was done intentionally or absentmindedly, whether it was done willfully or forcefully. This also applies if the woman places the male member inside her while the man is asleep, whether the penis is erect or not, whether the penis is circumcised or uncircumcised. All these situations require that the person committing the act and the one the act is committed on must wash themselves, unless the person committing the act or the person the act is committed on is a young male or female. In that case it cannot be said that the person must wash, for they do not have the responsibility, rather it is said that this person is in a state of impurity. If that person can discern (the sexual act) then his guardian can command him to wash just as he commands him to perform the ablution washing for prayers. For if he prays without washing, his prayer has not been performed correctly; likewise if he doesn’t wash after he reaches puberty he must be forced to wash. If he washed as a youth and then reaches puberty, then he does not have to repeat the washing.
Our companions have said that intercourse occurs when a healthy male’s penile head completely penetrates (an orifice), as has been unanimously agreed. Thus, when the penile head has completely disappeared (inside the orifice), then all the regulations concerning washing apply. It is unanimously agreed that it is not necessary that the entire penile shaft penetrate to apply the regulations of washing. If part of the penile head penetrates, then the regulations of washing are not imposed as is agreed, except by an odd few of our companions who said that even in this case all the regulations of washing apply. However, this opinion is wrong, rejected and abandoned. If the male member was severed and what remained was less than the length of the penile head, then none of the washing regulations apply. If the part remaining was equal in length to the penile head length then that part must completely penetrate for the regulation of washing to apply. If the part remaining was greater in length to the penile head length then there are two famous opinions for our companions. The most correct is that if the portion that penetrates is equal to the length of the penile head, then the regulations for washing apply. The other opinion is that none of the regulations for washing apply until the entire remaining length of the penile shaft completely penetrates and Allah knows best.
If a man wraps a sheath around his male member and then ejaculates inside a woman’s vagina, then there are three opinions from our companions. The most famous is that the man must wash. The second is that he does not have to wash because he ejaculated inside the sheath. The third is that if the sheath is thick and prevents climax and wetness (in the vagina) then washing is not necessary, otherwise it is necessary and Allah knows best.
If a woman inserts (in her vagina) an animal's penis she must wash, and if she inserts a detached penis (thakaran maktu-an, lit. “a severed male member”) there are two opinions; the most correct is that she must wash.
Sahih Muslim - Book of Menstruation - hadith #525 - Commentary
