Christians have to either deny evolution or pollute evolution with god bullshit, because they know evolution kills their heaven fantasy.

Christians would become mentally disturbed if they had to throw out their cowardly belief in a magical paradise. They don't have a lot of common sense but they know if they are just animals and not special magical creations of their god fairy, then most certainly heaven is just a myth. So Christians have to deny evolution no matter what the evidence says.

Since evolution equals no heaven, and since heaven absolutely must be true (even though it's a ridiculous impossible idea), then evolution has to be false, and the world's biologists are stupid and/or dishonest.

Since for a Christian evolution is definitely false, it would be a waste of time to study the evidence for it, so they don't bother with it. They don't even try to understand how evolution works. Why should they waste their precious time studying something that couldn't possibly be true?

Of course evolution is true. It's a basic fact, stronger than any other fact of science. So how can these drooling morons be convinced they're wrong?

The answer of course is they can't be convinced. Trying to explain the established truth of evolution to a Christian would be like trying to convince a Muslim suicide bomber it's not really in his best interest to blow himself up to murder a few dozen innocent people. Insanity can't be fixed.