Why do so many atheist historians think that 1 Corinthians 15 is reliable history?

Which passage of the Bible is the favorite of Christians who like to defend the Christian worldview? I don’t mean which one is most inspirational… I mean “which one is the most useful for winning arguments?” Well, when it comes to the historical Jesus, the most important passage has to be 1 Corinthians 15:3-7. The tradition in 1 Corinthians 15 is an early creed that was received from the eyewitnesses Peter and John when Paul visited them several times in Jerusalem, as documented in Galatians 1 a