In the 16th century there was again a movement against the belief in the Holy Trinity. Fausto Sozzini (1539-1604) was well known for teaching this as well as Ferenc Dávid (1510s - 1579). These movements developed into what is called Unitarianism today. Unitarians believe that there is only one person in god, not the three-in-one dogma of trinity. Some of the teachings of Jehovah's Witnesses are close to some of the things Arians believed. It is different only in that Arians believed the holy spirit is a person and Jehovah's Witnesses teach it is not a person, but a force God uses to do His will. It would however be false to call them Arians, as they reject many Arian teachings. Mormons and Oneness Pentecostalism also reject the Holy Trinity but for different reasons other than Arianism.