Moral objections to Islam

There are many objections to Islam i.e resaon why it's not true or reason why i don't believe in it.
Mohammed's personal life is not a good example for us to follow.
1.You see , if someone calls himself a prophet and marries a 6 yr old girl , he is a false prophet not a true one.A false prophet cannot come up with a true revelation.
2.If someone calls himself a prophet to the world and marries his daughterin law ,after asking his adopted son to divorce her ,because Allah told him to marry her,then ,you know for sure he is a false prophet.

Jesus said in matthew 7
"Every tree is known by it's fruit.....No good tree bears bad fruit"

So when we apply the principle Christ has taught to prophet mohammed ,he turns out to be a false prophet.
I think ,that is sufficient to rule out Islam.Since the messenger is not true,the message cannot also be true.