God

Where in the Bible are the doctrines of the Trinity and Incarnation?

Do all Christian denominations refer to Christ as God? Aren't there some that think he was just a man?

No, the doctrine of the Trinity and the Incarnation is orthodox Christian belief that has endured from the earliest days of Christianity. Throughout history, anyone who has denied these teachings has been considered heretical and outside of Christianity, not as just another denomination of Christianity.