Ken is trapped in an all-or-nothing mentality. If the Bible's claims about biological origins are false, then it's claims about souls and the afterlife must also be false. In order for him to believe that he will go to Heaven when he dies, he must also believe that the Earth is just several thousand years old and biological evolution is impossible. Ken wants to believe he's going to Heaven, so decades of study by hundreds or thousands of scientists with mountains of evidence must all be dismissed with a wave of his hand.
For him, there is no compromise, no middle ground, no other resolution. His mind is made up; don't waste his time with the evidence.