The Christian does not know that the true spirit of charity which the Muslim displays, always, towards Jesus and his mother Mary spring from the fountainhead of his faith- the Holy Quran. He does not know that the Muslim does not take the holy name of Jesus, in his own language, without saying Hazrat Eesa (meaning revered Jesus) or Eesa alai-hiss-salaam i.e. (Jesus peace be upon him).More details at Islam 101.
Every time the Muslim mentions the name Jesus (pbuh) without these words of respect, he would be considered disrespectful, uncouth or barbaric. The Christian does not know that in the Holy Quran Jesus (pbuh) is mentioned by name five times (5x) more than the number of times the prophet of Islam is mentioned in the Book of God. To be exact - twenty five time as against five.