Deaf Missions exists for one purpose: To effectively communicate the Gospel of Jesus Christ with deaf people. This statement merely focuses the Great Commission of Jesus, which is to preach the Gospel to all people, on a group of people who have generally been left out.
Deaf Missions uses sign language to “effectively communicate,” specializing in reaching people who were born deaf or became deaf prelingually, and who prefer using American Sign Language instead of English. These people are usually considered to be part of the Deaf culture. It is not that they need the Gospel more than any other people, but that they need the Gospel presented to them in their own language–the same as any other culture or people-group requires.