And who gave you the right to make the Nicean Creed the definition of what it means to be a Christian.
The Nicean Creed is essentially the restatement of belief in God using the concepts of Neoplatonic realism. Is Neoplatonic realism, concepts not found in the Bible, that important?
Oh please. You do not have to apply ancient Greek metaphysics to get the trinity and other doctrines out of the bible. Just read the Gospel of John. It makes the divinity of Christ abundantly clear. Mormonism is a racist and sexist heresy.
Doctrines & Covenants - not found in the Bible; are THEY important?