There is a word that an early convention decided meant Christ was divine, what was it?

Homoousios, meaning “same substance” or “same essence” or “one in being”.

homoousion

@submariner bravo, thanks. Isn’t there another word that is very close but means something else?

yes, homoiousios

I see…The latter being similar essence instead of same essence as God.

You seem to be talking to yourself, haha.

homoiousios vs. homoousios

seem? I think that is an understatement!

So are you two the same user, or are you both wundayatta?

That early convention would have been the Council of Nicaea, so while I don’t know the term offhand, you could probably start there and find it.
EDIT: Or, upon Wikiing it (it’s a term…), I found this:

The Homoiousians proposed that God and the Son were alike, but not the same, in substance. This compromise position did not gain much support and eventually the idea was dropped.

How do you pronounce the two?

Oh, and where would Arianism fall in this?

@weeveeship : Pronounced (by Anglophones) homo-ousion, with “ou” a diphthong of o and u (oo), I think.

Arius denied this doctrine. Read the link in my first post.

So far so good. In the Western Latin tradition homoousion was settled by a Roman lawyer, the great church father, Tertullian, who called it substantia. And the Greek Hypostases became tres personae. Three persons, one substance. The Triune God of the Christians. As to the final wording, the Nicene Creed was finalized in 381 at Constanople. The Constantinopolitan Creed is what we confess today even though it is called the Nicene Creed. Comparing the two is a good read.