Jesus told you when it began and you prefer the Catholic encyclopedia ..what can I say ?
A covenant has no value if it is never signed..
Hbr 9:15 And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions [that were] under the first testament, they which are called might receive the promise of eternal inheritance.
God's covenant with men didn't begin with the Incarnation of Jesus? Wait a minute - I thought that God was in control. Are you saying that God was powerless until men agreed to His New Covenant. Odd, wouldn't you say? Same with Moses - did the pact begin with God or did it begin with the blood?
Jesus told you when it began and you prefer the Catholic encyclopedia ..what can I say ?
The Gospels tell differently from your claims. Luke 1 is very clear. John 1 is also instructive. The pact that God offers is in effect when He offers it, unless you would have men have more power than God to accept or reject pacts with Him, which makes no sense whatsoever in Reformed theology.