Saint Peter, according to the New Testament, was one of the Twelve Apostles of Jesus Christ. Saint Peter is often depicted in modern media as the gatekeeper of Heaven, although this image is not found in traditional religious art.
Cleveland tries to enter Heaven after being shot and killed by Stewie in "Lois Kills Stewie", but Saint Peter demands a credit card to imprint. When Cleveland points out that the guy in front of him met no such demand, Saint Peter tries to dismiss it as a very new policy. When Saint Peter continues to press for a credit card, Cleveland points out that he has a Sears card. When Saint Peter snidely remarks that they are doing well, Cleveland points out that the one near his house has a McDonald's right in the store.