A quick look at the Rastafari religion on Wikipedia may lead you to believe they consider themselves a kind of Christian.
Rastafari, also known as Rastafarianism, is an Abrahamic religion that developed in Jamaica during the 1930s. Scholars of religion and related fields have classified it as both a new religious movement and a social movement. There is no central authority in control of the movement and much diversity exists among practitioners, who are known as Rastafari, Rastafarians, or Rastas.
Rastas refer to their beliefs, which are based on a specific interpretation of the Bible, as "Rastalogy". Central is a monotheistic belief in a single God—referred to as Jah—who partially resides within each individual. Haile Selassie, the Emperor of Ethiopia between 1930 and 1974, is given central importance. Many Rastas regard him as an incarnation of Jah on Earth and as the Second Coming of Jesus Christ, another figure whom practitioners revere. Other Rastas regard Haile Selassie not as Jah incarnate but as a human prophet who fully recognized the inner divinity in every individual.
They certainly seem Christian inspired, however, are they "Christian" for purposes of this site? My understanding is that the bar is pretty low: "Christians" on this site are any of those groups that self-identify as Christian. So do they self-identify as Christian, and therefore their beliefs are on-topic?