But Paul is pretty clear on what matters.
The whole project of Christianity stands or falls on one thing. The lynchpin of the whole thing is the Resurrection of Jesus (1 Corinthians 15).
If we believe Jesus was raised from the dead, a lot of other stuff then has a framework to make sense: God's miraculous creation of the world, doing good in this world and preparing for the next, etc.
Don't let people convince you otherwise to sell books or have conferences. The key issue is, has been, and always will be the resurrection.