There are new denominations being born every day. People can't agree on interpretations so they create new sects that believe different things. Someone did a count back around 2,000 AD that identified 34,000 denominations of
Protestantism alone. Criticism of the ambiguity of the Bible aside, the prominent denominations are as follows:
Roman Catholic (over half of all Christians)
Protestant (Lutheran, Baptist, Calvinist, etc)
Anglican (technically classified as a Protestant denomination, but differs considerably in several areas that lead me to classify it differently)
Mormon
Jehova's Witness
Non-trinitarian (Gnostic, Arian, Unitarian, etc)
Like I said, there are too many denominations to list them all. Nor do I have any intention of trying...
P.S. In case anybody is confused, "Arianism" as per the Non-trinitarian denomination refers to the teachings of Arius in Alexandria in the 4th century AD before he was declared a heretic by the Council of Nicaea. Not to be confused with Hitler's Aryanism; that was a pseudo-anthropological movement propagated in the 19th and 20th centuries by Indo-Europeans seeking to firmly establish their superiority over other ethnicities in biological terms in order to vindicate their military conquests.