Quite simply by recognizing the world has had many Jesus's over the eons and like St. John of the Cross, or Ramakrishna or the Sufi's....the teaching of Jesus is universal and not confined to Christians.  Jesus (I think) never believed in Christians over others (obvious in one way as it was not coined at that point) and recognized that if you followed non-violence and love of neighbours than God realization is something for everyone.   Ghandi would comment that sometimes the people who understood Jesus least were Christians.