You will always try to defend all things related to your religion- Islam in public. That is okay. But if you think independently, in private, then you will find that Islam was spread not by teaching, but by sword. This is a fact supported by historical proof.
Even your Koran says that if someone does not believe in Allah, he can be killed, his propoerty looted, his wife can be taken and she can be raped.
These things, a man with a sensible brain and human feeling can NEVER support.
The only way out is to think that these things happened when the humans were uncivilized. And this is true. That is why, the muslim community must modify their way of thinking. If they continue to pass these ideas to their children, the world will go back to a point where we were almost monkeys.