Hi, and welcome to RF.
1) He could have said no to the marriage, though. Just because it was an arranged marriage doesn't mean he had no say in accepting it. Furthermore, if Islam is supposed to be the eternal truth for humanity, why would its prophet marry according to a Pagan tradition, as you say? Islamic theology is diametrically opposed to Paganism and polytheism. You would think Muhammad wouldn't adopt Pagan traditions, no?
2) I don't have extensive knowledge of Hinduism and so don't know if such a story is believed by any major branch of Hinduism, but even if it is, that doesn't say anything about Muhammad's marriage to A'isha. Hinduism's being right or wrong doesn't reflect on Islam's truth value or lack thereof.
3) I'm not sure what you mean by "power of young girl." Which power? The "power" to give consent? Then yes, nine-year-olds are definitely incapable of giving informed consent. There's a reason the legal age of consent in today's world is usually 18. Nine-year-olds are incapable of making informed decisions about things like their own school education, much less sexual relationships.
The only thing I think one could argue to possibly explain—merely explain, not justify—Muhammad's marriage to A'isha is that the cultural and historical context of Muhammad's time was vastly different from now, but even then, the hadiths about how A'isha still played with dolls when she was married to him are deeply problematic and concerning, in my opinion, especially since Muhammad is viewed as a moral example by hundreds of millions of people.
4) I don't know about the story of Isaac's marriage to a three-year-old. That sounds quite... bizarre. I've never talked to any Jews who said that he did. Also, I think your statement that "Jews allow having intercourse with three years old girl" is dangerous and slanderous if you can't back it up with strong evidence. Is that the official position of any of the more common strains of Judaism, or is it the belief of fringe groups, if even those? It would be quite concerning if anyone believed that, but your statement that "Jews allow [...]" makes it sound to me like a significant number of Jews believe that. Is that what you intended to convey here?
How do you feel about communal possession; (not really ever in favor king or "otherwise") oh and the whole robin hood idea (again not in favor king or "otherwise".. This isn't just about how women and men are treated but the right to even have what is simple and best one common relationship and property. Not only that they seemed to be obessed with spirits.... I
(I DONT like in shape for or value)
God (that is, Ahura Mazda, the good deity) had
created all men alike and placed the means of procreation and sustenance on
earth "so that mankind might divide them equally among themselves"17;
women and property should be held in partnership like water, fire, and pasture;
lR nobody was allowed to monopolize them, sharing was a religious
duty.1' Sharing wives and property would diminish the power of
Az, concupiscence,
a force through which Ahriman (the evil deity) worked on mankind.
Az thrived on both excess and deprivation, but fulfilment in the right measure
was the remedy against it.20 Like Kavad, Mazdak was a vegetarian; and he,
too, wanted to eliminate war, hatred, and dispute, though in practice he was
responsible for massive bloodshed.21 He raised a peasant revolt. His followers
were the poor, base, weak, and ignoble plebs (al-fuqara', al-s$a, al-du"afa',
al-ghawgha'). They "would break into a man's home and take his dwelling,
his wives and his property without him being able to prevent them"22; "they
killed those who did not follow themu2'; they claimed that "they were taking
from the rich and giving to the poor, and that whoever had a surplus in respect
of landed property, women or goods had no better right to it than anyone
else."24 Mazdak himself "would take the wife of one and hand her over to
another, and likewise possessions, slaves, slavegirls and other things, such as
landed property and real estate."25 Huge numbers followed him:
And other threads::: Actually Zoroastrians did persecute others - under the Sassanids they persecuted
Roman Christians while members of the Persian Church were treated quite favourably which suggests it may have been a national thing, and they persecuted those belonging to Zoroastrian sects regarded as heretical like Mazdakism or Zurvanism (which is regarded as heresy today but enjoyed the support of the Sassanid state at the time). After the Muslim conquest of Persia, Zoroastrians sometimes enlisted the aid of Muslims against members of heretical Zoroastrian sects.