He's of Palestinian/Syrian descent. Christian, my ass.
https://en.wikipedia.org/wiki/Justin_Amash#Early_life_and_career
Born in Grand Rapids, and raised in Kentwood, Michigan, Amash is the son of a Palestinian Christian father and a Syrian Christian mother.
His father, Attallah, is a business owner, whose family immigrated to the United States in 1956 through the sponsorship of a Christian pastor and his family. His mother, Mimi, is a Syrian immigrant to the United States.