Maybe you shouldn't generalize so easily. You're right, right now I'm applying for college but, I have heard all of these and have answers for them.
Those who guard their chastity...
...except from their wives or (the slaves) that their right hands possess, for then, they are free from blame”
al-Mu’minoon 23:5
What is meant by “those whom their right hands possess” is slave women or concubines.
But there are conditions.
Firstly, the Quran did allow sex with one's sex slave. But it is conditioned. Firstly, this sexual contact must take place in marriage.
And as for those of you who, owing to circumstances, are not in a position to marry free believing women, [let them marry] believing maidens from among those whom you rightfully possess. And God knows all about your faith; each one of you is an issue of the other. Marry them, then, with their people's leave, and give them their dowers in an equitable manner - they being women who give themselves in honest wedlock, not in fornication, nor as secret love-companions. (4:25)
A slave-girl cannot be raped, as according to this ruling by al-Shafi reflected in various fiqh,
Al-Shafi’i said, “If a man forcefully acquired a slave girl and then has intercourse with her thereafter, and he is not ignorant, the slave girl is taken away from him, he is fined, and he is punished for adultery.” (Kitab al-umm)
Which is based on the narration where Umar commands Khalid bin Walid to stone to death Dirar ibn al-Azwar who rapes a captured girl. Sexual contact with a slave girl outside of marriage will be punished with zina and if it is through rape, she shall be freed immediately and he will be killed or exiled depending on the jurist.
And do not, in order to gain some of the fleeting pleasures of this worldly life, coerce your [slave] maidens into whoredom if they happen to be desirous of marriage; (4:33).
The Prophet married Aaisha when she was six years old, and he consummated the marriage with her when she was nine, and at that time he was over fifty. Islamic Law states that if a girl passes puberty, she is allowed to be married.
Plus, you are forgetting that Mary got pregnant when she was 13-14. Are you willing to call everyone, including your ancestors, child rapists?
For the Prophet hitting Aaisha, he pushed her or poked her in the chest; this does not reach the level of real hitting that is intended to cause pain and to humiliate. In fact it is stated in Lisaan al-‘Arab (3/393) that one of the meanings of the word lahd (translated here as shove) is poke.
Now take a step back. A man may live with his wife for many years, and she may do many things because of the jealousy that is an inherent part of women’s character, but the Prophet is not known to have ever caused her harm in word or deed, except for what is mentioned in this hadeeth, despite the large number of narrators who transmitted all the details of his life.
You said that the killings the Prophet commanded, but they were only during war. Only when there was war was there killings and when the pagans surrenders, they stopped the killings immediately. They didn't burn anything down nor did they hurt women or children. They didn't burn down building or trees. You can find all this information online, but only choose to pick the ones that fit your narratives. I wonder who are really the fools...