• yes they believe in jesus
• The Christian religion has three Major subsets. the First of which is the Roman Catholic church, i only list it first because it is the oldest. the Second are the Eastern Orthodox churces like the Russian and Greek orthodox. (they are sometimes refered to as catholic though usually the term is reserved for the roman catholics) They split off from the roman catholic church in The Great Schism. The Third are the Protestant denominations (which include Anglicans, Lutherans, Baptists, Presbyterians and many more) they split from the Roman Catholics in Europe during the Protestant Reformation.
• The three subsets are separated by numerous theological differences, including the position of pope and saints.
• Catholics revere the saints and especially Mary since she is the mother of jesus and said to be without sin. you have it kind of right, its not that they worship the saints. They offer prayers to the saints and ask for guidance from the saints or prayers on their behalf from the saints to god. The saints are more role models than anything as they are as close to jesus like as a human can become.

I apologize i did assume that you were a westerner. I was raised catholic and pretty early on got sick of Protestant christians telling me that catholics were not christian. Even though i am no longer christian it still irks me just because it is false on the simple basis of history. if you don't mind my asking, where are you from?