1 Chimp-human difference is too high for both to have descended from a common ancestor.
The number of base pairs in human DNA is 3,164,700,000:* just over 3 billion. A chimp has at least 10% more DNA than a human, and in the rest there is a difference between them of around 2%. This means that in total there is at least a 12% difference in the DNA of humans and chimps. Since evolutionists claim that they divided from a common ancestor about 6 million years ago, and usually accept a generation span to be around 20 years, it is a simple calculation to work out how much DNA had to change per generation to produce the difference we now see.
If we assume the same amount of change took place in the chimp line as in the human line, then 632.94 base pairs had to change on average in every generation in both lines.* This is over double the maximum amount that has been observed to change per generation in humans.
So even apart from any other consideration, the amount of change necessary for evolution to be responsible for the rise of chimps and humans is impossibly high. However, there are other significant difficulties, which can be seen in The Challenge.
* Or at least, it was when I first viewed the Human Genome Project (HGP) website. Wikipedia presently estimates it to be 3.2 billion and HGP gives the various estimates since the year 2000 here.
12% of 3,164,700,000 = 379,764,000
379,764,000 / 2 = 189,882,000
6,000,000 / 20 = 300,000
189,882,000 base pairs/ 300,000 generations = 632.94 base pairs per generation.