So you are questioning whether Mohammad was a messanger of god... and that is why he wrote a bad book with contradictions? Even thou the higest Islamic scholars can show you what it really is what you see as contradiction.
The question is how to interpret them.
Exactly, it's all about interpreting. That is why I rather stick to my own wisdom, and definitely not surrender to "some Muslim scholar".
Below a few "interpretations/views" by "Al-Qaradawi" (an internationally known influential scholar; how many girls suffered because of his book?):
1):
He wrote a book when he was age 61 stating about female circumcision: "I personally support this under the current circumstances in the modern world.
Anyone who thinks that circumcision is the best way to protect his daughters should do it." [He read and memorized Koran by age 9 BUT still at age 61 thinks this mutilation of women is the best; tells me something about a guy]
2): Age 82 he declares "Throughout history, Allah has imposed upon the Jews people who would punish them for their corruption ... The last punishment was carried out by Hitler. By means of all the things he did to them – even though they exaggerated this issue – he managed to put them in their place. This was divine punishment for them ... Allah Willing, the next time will be at the hand of the believers."
3): Age 87 he declares "In February 2013, Qaradawi stated on Egyptian television that the application of the death penalty for those who leave Islam is a necessity, stating, "If they had gotten rid of the apostasy punishment Islam wouldn't exist today."
4): He supports suicide attacks on all Israelis, including women[97][98] since he views the Israeli society as a "completely military" society that did not include any civilians.[99] He also considers pregnant women and their unborn babies to be valid targets on the ground that the babies could grow up to join the Israeli Army
5): Qaradawi urged women to not masturbate and elaborated that its dangerous to stick things into the vagina
6): When asked about the punishment for people who "practise liwaat (sodomy) or sihaaq (lesbian activity)", al-Qaradawi replied: "The same punishment as any sexual pervert – the same as the fornicator." (MEMRI translation).[124] The punishment for fornication is lashing
But I also must say that he had a few good views. BUT above ones I find quite bad, don't you think so. And that's why I rather stay far from Muslim scholars. They tend to follow their book and forget many times to follow their heart. That is the major problem with spiritual scriptures IMO.