First of all, most of the allegations you have raised is no different than what the non-muslim would do to defame Islam. Maybe you got those from reading non-islamic sites. Brother before you can even go to those sites your own understanding of deen must be strong enough.
Rebuttal 1: yes Hazrat Aisha was married at the age of 7 and consummated at the age of 9. This was a prosperous and happy marriage. For more information on their love: http://www.islamswomen.com/marriage/ayshah_and_muhammad.php
Hazrat Aisha (ra) was happy and so was Prophet Muhammad (pbuh). What they did in bed is their own private matter and we are outsiders to that. Now after 1400 years the non-muslims have a problem with their marriage when in fact Hazrat Aisha (ra) didn't. There isn't a single hadith in which she was displeased with her marriage.
The standards keep changing. My mother got married at 18, my grandmother when she was around 16. By today's standards my grandmother might be a teenager getting married and might sound odd, but those standards will keep changing and what Islam says will stay universal.
So the point is, Aisha, peace be upon her, might look as child to you, but back then she certainly was considered as "woman" who was qualified for marriage.
Rebuttal 2: Prophet Muhammad (pbuh) was a husband and he can have romantic relations with his wives. There is nothing abnormal with that. Fondling doesn't mean penetration. Penetration is definitely haram during menses. For argument sake, if a normal husband has romantic relationship with his wife then its no problem. But if Prophet Muhammad (pbuh) has it with his wives then its abnormal? Why the double standards mate?
Anas relates that the Jewish men used to avoid eating together with their women while the women were in their menses, so the Prophet (peace be upon him) said: "Engage in everything except intercourse."
This is an authentic hadîth related in Sahîh Muslim (302) and other sources.
Rebuttal 3: the question of "sex slaves" is again a very common allegation. For full response you may refer to this website: http://www.answering-christianity.com/umar/slave_girls.htm
Rebuttal 4: the last point you are trying to point is that since woman is impure during menses therefore her husband shouldn't approach her at all. The "exemptions" of Islamic duties are on the wife's part not the husband and it isn't a sin but a normal biological reaction. And this isn't something "invented" by Islam as stated in this hadith:
The Mother of the Believers Aisha (Allah be pleased with her) said, “We left with the Prophet (Allah bless him and give him peace) for the pilgrimage. When we were in Sarif (a place close to Makkah) I began to menstruate. The Prophet (Allah bless him and give him peace) approached me and I was crying. He said, ‘Did you get your period?’ I said, ‘Yes’ He said, ‘Verily this is a matter Allah has written upon the girls of Prophet Adam (Allah bless him). Do all the actions of the pilgrimage except the tawaf.’ [Bukhari]
One more hadith to prove that it is a ritual impurity:
The Mother of the Believers Aisha (Allah be pleased with her) said, “The Messenger of God (Allah bless him and give him peace) said to me, ‘Get me the prayer mat from the prayer area.’ I replied, ‘I am menstruating.’ He said, ‘Verily, your menstruation is not in your hand.’ [Muslim]
There it is ritual impurity not actually a "impurity" which is common misconception. The following zikr she can do whilst in menses:
1) Listen to the Quran, ponder about its meanings, and cry.
2) Buy a supplication book and make constant dhikr.
3) Send blessings on our beloved Prophet (Allah bless him and give him peace).
4) Spend time with her family and loved ones for the sake of Allah.
5) Attend religious lectures and classes.
6) Read about the righteous and pray to be of them.
7) Supplicate for whatever she wishes.
8 ) Beg for forgiveness and the pardon of her sins.
9) Get involved in her local community and help others.
10) Reflect about her life and thank Allah for all her blessings.
If you notice the additional symptoms of menses:
1 Abdominal or pelvic cramping.
2 Lower back pain.
3 Bloating and sore breasts.
4 Food cravings.
5 Mood swings and irritability.
6 Headache and fatigue.
So if she does her ibadah after her menses she will more fit physically and mentally. Therefore it is to show that Allah understands the woman's biology.
Please post direct quotations rather than your own interpretations of the hadith. If you want your misconceptions cleared you're welcome but let me inform that I shall not engage in debates beforehand (thanks for understanding).
Before any further issue is raised on so called "child marriage" let me assure you there is a list of other woman who can give birth at young age:
This is to show that they are physically able to become mothers at such age which we presume to be tender. Thus they are able to get married as well.
You may also find this quite coincidental/surprising/logical with Hazrat Aisha (ra) marriage age:
Most girls will begin puberty at 8-14 years of age, with the average age being 11. (NHS)
Puberty: the period during which adolescents reach sexual maturity and become capable of reproduction. So a woman's puberty is at a younger age.
So scientifically speaking their marriage is a blessing and perfectly logical.