The ethics of both Christian and Islam is for all of us to live peacefully with one another through obeying some principle and laws. If we obey those laws we would be able to live in peace in our society.
Wonderful sentiment.
If it is said by a Christian, he has the whole New Testament to back it up. Anybody can make a mistake and be violent... even Christians who don't know their own N.T., or people who only say they are Christians, but are not.
If it is said by an outsider who is neither Christian or Muslim... you better check out where he is coming from. For example, an atheist might say that a woman's body is her own. So she can abort her baby righteously. But they forget about the life of the baby.
If it is said by a Muslim, it's
scary. Why? Because of all the violence dictated for Muslims to do by the Koran and the Hadiths -
http://www.thereligionofpeace.com/quran/023-violence.htm. You never know when a Muslim is going to start following the violence, no matter how sweetly he talks to you.