why is it that catholic christian pray rosary and other christian denomination does not?
The rosary is a Catholic tradition. A few other Christians pray the rosary, but most do not. Tradition has that St. Dominic was told this pray by Mary herself in a vision or dream around 1200. The pray-er meditates on events in Christ’s life while saying certain prayers. Some non-Catholic protestants are against prayers to saints, Mary, or anyone deceased. Some are against any “rote” or memorized prayer and against repetitious prayer. Catholics believe that it is both Biblical and traditional that saints can “intercede” and pray to God about us. Detailed explanation in the sites listed below. Interesting note: it is not a necessity for Catholics to believe in or practice “sacramentals” (including the rosary) to be Catholic, but the rosary is church-approved.