Bart Ehrman, probably the famous atheist New Testament scholar today on the resurrection claim of Jesus, said there are 15 independent sources for the resurrection within 100 years of the cross.

Probably the leading scholar today on the resurrection, Gary R. Habermas, said he has 18 sources for the life of Jesus, many of which are non-Christian of the life o Jesus in his book The Historical Jesus.

Paul wrote that he spent 2 weeks with Peter, time with James, and again many years later with all three Peter, James, John. It's safe to say they talk about more than just the wind.

And Paul said when they met in terms of Jesus they had nothing to add so this shows they were in complete agreement.