It’s difficult to say just how many different sects of Christianity exist in the world today. Ever since the ministry of Jesus Christ, there have been countless schisms and disagreements about particular points of doctrine, resulting in innumerable branches and congregations, each teaching slightly different dogmas. Additionally, each individual adherent of the many churches often has their own set of beliefs that may or may not fit perfectly with the canonical doctrines of their church.
That said, Christianity could be divided into several basic groups: Catholic, Eastern Orthodox, Oriental Orthodox, Protestant, and Restorationist.
The following is a partial list of Christian denominations, in no particular order:
Seventh Day Adventist
Assyrian Church of the East
Also, there is a growing number of groups and individuals who believe in the divinity of Jesus Christ but do not consider themselves part of any sect. They are sometimes called Non-denominational or simply Christian.
See also, How_many_types_of_christians_are_there