Re: Hearsay
That something was or is hearsay did or does not invalidate it. If someone gives you a first-hand report it is not hearsay. Its only when you relate second-hand what you have heard first-hand from someone else does it become hearsay.
Hearsay and Heresy Have Unrelated Linguistic Roots (hear + say != heresy)
From Grammarphobia.com:
There is more relationship between 'creator' and 'creditor' than between heresy and hearsay. The English language is not the best language to attempt word cleverness like that.“Hearsay” was first recorded in writing in 1532, and is described by the Oxford English Dictionary as a substitute use of the phrase “to hear say,” which in turn was in use before the year 1000.
The OED defines “hearsay” this way: “That which one hears or has heard some one say; information received by word of mouth, usually with implication that it is not trustworthy; oral tidings; report, tradition, rumour, common talk, gossip.”
The roots of the noun, the verbs “hear” and “say,” go back to Old English and have their origins in ancient Germanic sources.
The noun “heresy,” on the other hand, is from Greek.
It was borrowed into English, probably before 1200, from the Old French word eresie or heresie, an adaptation of the Latin haeresis, which comes from the Greek hairesis.
The meaning in the classical languages was broader than in English and referred to a taking, a choosing, a school of thought, a set of philosophical principles.
The English “heresy” is defined by the OED as “theological or religious opinion or doctrine maintained in opposition, or held to be contrary, to the ‘catholic’ or orthodox doctrine of the Christian Church, or, by extension, to that of any church, creed, or religious system, considered as orthodox.”
Re: sons of God
I suppose one who fails to comprehend the relationship between the role of creator and father and created and son would consider someone calling themselves a son of God to be a heresy.
If the State can have children (parens patrie) then what an error to believe in the living God's inability to father. The idea of denying the possibility of there being any such things as "Sons of God" is to deny God's power to create or to give life. Those who ask for or seek out an impersonal god just might get what they ask for--but they ought not hate on to those who have done otherwise. Perhaps the heretical Gnostics' detesting the physical realm some relates to the Serpent's perspective on being under the curse of feeding on dust and not liking it.