The Central Valley of California has many Oneness churches, The United Pentecostal being the most prevalent. Many churches using 'Apostolic' within their names are also Oneness churches, although Armenian Apostolic Churches are part of the Ancient Early Church and are Trinitarian. IMHO, denial of the Holy Trinity takes one outside of orthodox Christianity. This is not a new heresy, the Early Church combated Arianism of which the Oneness teaching is just another form. Jehovah Witnesses use Arius teachings to deny the Holy Trinity. Another church growing quickly in Philippines is Iglesia Ni Christo also denies The Holy Trinity. There really are no new heresies, just reinventions of original ones. Pantheism is throughout New Age beliefs and Wiccan practices.