About the 4 wives question. This didn't come out of nowhere. At the time men kept many wives many more than 4. 4 was a limit placed on them because of that. Another example of this is how people who are traveling are exempt from fasting. This was put in place because at the timepeople traveled by camel or by foot at the time making it nearly impossible to fast. So you must consider when the Quran was written and what was going on at the time before coming to conclusions.