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*Sigh* What we today call the Old Testament certainly did exist. That contained all of the prophecies of Christ, the foretelling of the Word coming to the Gentiles, and it is what Christ and the Apostles preached from. Quotes from the O.T. are commonplace in Matt/Mark/Luke/John/Acts.

The 'Gospel' is the good news that Christ has come, that there is forgiveness from sin through repentance, and that Christ made this possible via his substitutionary sacrifice - paying the penalty for my sin. The preaching of the time was that the Kingdom of God was here and all of the scriptures of that time were being fulfilled right in front of them.

"*Sigh* What we today call the Old Testament certainly did exist. That contained all of the prophecies of Christ, the foretelling of the Word coming to the Gentiles, and it is what Christ and the Apostles preached from. "

You must be kidding if you think the Apostles only preached out of the Old Testament. You make the teachings of Christ void by your argument because they were not yet put to writing.

So they can just forget the words of Christ himself:

Mat 28:20 Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world.

So now the Gospel is the Old Testament?