It would seem a simple enough question, but I'm not so sure it is. It should be easy enough to find the answer to this question but I would look before I made up my mind if I were you.
Why would Peter not preach it if it was there for him to preach ? (Speaking of Acts) And yet what does he preach ? He preaches that Jesus Christ is the son of GOD, the promised one. He preaches a murder indictment against the Jews. And he preaches that Jesus Christ was raised.
Every word of it true, but how much of it means salvation to you ? Let me ask that another way. Where would you be without the Blood of Jesus Christ ? Are you quite sure the blood was there in Peters preaching in Acts ? Where in the BIble can you read and point out that "here" is the point that it was first preached that Jesus died for our sins and that his blood cleans us from those sins ?
There is where you'll find the "Church" IMO.