Christians. Could you be wrong?

[Diablo]

But in evolution, there was clearly a first human. Just as there was a first human in the Bible. How do they contradict according to genetics ? (not using dating)

Sorry, but that is absolutely incorrect. Evolution is a micro, micro accumulation of changes over a very long period of time. It's the same concept as moving a pile of sand from one place to the other. At what point does the new accumulation become a new "pile"?

At no point can you stop the clock and say, "there! that thingy is a human".

Doesn't work like that.

That's a very good analysis. But there is a point at which a new species originates - that was the point of Darwin's essay, after all. When the genetic drift is far enough, and the animals can no longer interbreed, I suppose we can say that a new species has arisen. It may not be a precise point, but precise enough.

The whole point is that species originate because of those grains of sand.