I had to click back more than one link. Why did you not supply this link right away?
In 1 Corinthians 15:3-5, Paul quotes a pre-existing creedal statement. “[that] Christ died for our sins according to the Scriptures, and that He was…
beliefmap.org
It is as I said an apparently lying source. They quote mined the author. Their "quote" has all of the hallmarks of a quote mine:
Here is the "quote" as presented in that source:
' “…the elements in the tradition are to be dated to the first two years after the crucifixion of Jesus…not later than three years… the formation of the appearance traditions mentioned in I Cor.15.3-8 falls into the time between 30 and 33 CE.” '
Look at all of those gaps. We have no idea what he was actually claiming. By your standards I can now refute the Bible by simply quoting verses out of context that say "there is no God".
I will make a deal. If you are willing to admit that the Bible itself refutes the existence of God then I will accept your quote.