He must quote a Christian. Atheists have zero credibility. So quoting great evolutionary geniuses like Dawkins, Huxley etc., would be useless. And he knows it.
One gets the impression that evos think that by quoting Christians who they think support evolution, that means that the rest of us are obligated to support it as well.
*Oh gee. The Pope supports it. Now I have no choice.*
He's not my Pope and I can think for myself.
It's the same as non-believers quoting Scripture at Christians. They think that Christians don't see through the transparent attempt to control the Christians behavior.
Newsflash: Christians do not melt down over some non-believers throwing verses around. They do not think, "Oh No! He quoted Scripture at me. I have to do what he says!"
For some people the only time Scripture has any validity is when it's used as a weapon to bludgeon Christians with.
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Pathetic, but true.