Actually, that statement is accurate. Newton was certainly not orthodox, and was definitely not a standard Trinitarian but he appeared to firmly believe in Jesus as the "Lamb" and "Messiah" and absolutely considered the Bible to be God's word. See link
Actually, it's not. And I like how you cast it - "not a standard Trinitarian", when you and I both know that denying the Trinity is heretical ;)
He also denied the divinity of Christ with his dying breath, refusing the last rites. Take a look at "Never at Rest" by Richard Westfall and "In the Presence of the Creator" by Gale Christianson sometime - very interesting books...