Boyd is also a former Oneness Pentecostal, and wrote the book Oneness Pentecostals and the Trinity (1992), critiquing the movement's anti-trinitarian view of God and other doctrines.
Boyd juga bekas Oneness Pentecostal, dan menulis buku Oneness Pentecostals and the Trinity (1992), yang mengkritik pandangan anti-trinitarian gerakan itu mengenai Allah dan doktrin-doktrin lain.