Jehovah's Witnesses is a Christian denomination with non-trinitarian beliefs distinct from those of mainstream Christianity. The group is best known for it's door-to-door preaching and various literatures, particularly The Watchtower, as well as adherents' refusal to engage in military service or to receive blood transfusions. This particular congregation comprises residents of several communities throughout the greater Tampa Bay area, and has a large number of parishioners, many of whom are actively involved in their respective local communities.