The Heresy of Arianism
The heresy known as Arianism arose around 320 AD from an early struggle to come to grips with the doctrine of the Trinity and was named after Arius, who did not think it seemed fitting that the Eternal deity should condescend to have a Son. In its historical definition Arianism denies that the Son is of the same substance, essence, or nature of the Father. The Son is not co-eternal with the Father and is therefore not divine as the Father is.
In modern Arian thought, which seems to rely heavy on naturalism, it is said that Jesus was a good man, a prophet, or a wise sage but He was definitely not divine. By asserting that the divine qualities, though they claim he was not fully divine, of the Son overtook the human nature and thereby denying the full incarnation of the Second Person of the Trinity. By denying His divinity those who advocate Arianism do in fact support idolatry since, to them, Jesus is a created being.