An overwhelming majority of Christians do not regard Old testament as the ultimate guide. The majority of lessons are taken from the gospels of the New testament.....where the clear message is faith, hope & charity....of these three the greatest is charity. No Christian worth his salt will deny this.
Epsilon: In your narrow interpretation (you said you are a Muslim) of the Old Testament you are saying God exhorted everyone to kill idol worshippers......BULL.....you freak. I am glad you are not a Christian. NO CHRISTIAN INTERPRETS EVEN THE OLD TESTAMENT THAT WAY. Besides, I doubt if it is stated in the way state it. Bottomline, that is not the message, anyways Old testament has only a historical value to Christians....the essence being it was able to predict that the messiah will come....which christians believe is Christ.
Love & charity are above everything else in Christianity....that is Christ's central message.