Here's the chain of logic: Darwin's daughter died. Darwin blamed God. He invented Evolution to pay him back.
Here's the real story. Darwin didn't invent Evolution. The idea had been around for generations (his grandfather, Erasmus Darwin, was an advocate). Even with the comparatively few fossils available in 1800 it seemed apparent that (a)many species were no longer around and (b)the further down the geologic layers you went, the more primitive were the organisms you found. But there was a scientific problem - how to explain how species change?
This was Charles Darwin's contribution - he came up with the explanation which he called Natural Selection. He observed that (a)far more offspring were born than ever survived to reproduce, and (b)every organism was a little bit different to its parents. (You can go to Wikipedia if you want to know more about how this explains the variety of species that live and have lived.)
The problem is not with Darwin but with the Creationists flawed logic. Their thinking goes something like this: Evo threatens my personal view of the Bible. Therefore it must be an attack on that view. My personal view is correct and so it is what God wants me to believe. Therefore it is an attack on God. Why would anyone want to attack God? They must have a reason for hating him. Oh look, Darwin's favourite daughter died. He must have blamed God for that. That explains everything.
But over and above this simplistic logic is a deeper flaw. Darwin wasn't the only one who figured out the mechanism. He sat on his ideas for years until another biologist, Alfred Wallace, wrote to him with almost exactly the same suggestion. If Darwin hadn't published the idea, someone else would have - there was simply so much evidence being collected by so many people that the conclusion was inescapable.
Even if Darwin was a child-molesting, wife-beating axe-murderer, that would have no bearing whatsoever on Evolution. We accept Evo as the best explanation, not because we think Darwin was wonderful, but because of the millions of bits of evidence that have piled supporting his explanation.
So again, when you hear a Creationist trying to distract you by attacking the man who first suggested the explanation, ask him what he thinks that has to do with the science.