Do you REALLY think that it is just a "coincidence" that humans share 98.6% of their DNA with chimpanzees?!

The figure is real, and no honest answer starts by denying it. But a number only means something once you know what was measured and what it is supposed to prove.

1. The number is real but conditional. The initial chimpanzee genome sequence, published in 2005, reported just under 99% identity at aligned single-nucleotide sites. Widen the comparison to insertions, deletions, duplications, and regions that cannot be aligned, and published estimates drop to roughly 95% or lower. The percentage is a measurement choice, not a fixed fact about two species.

2. Similarity is data, not a verdict. Two things can resemble each other because one descended from the other, or because both were made by the same mind to do similar work. Similarity by itself cannot choose between those explanations. To get ancestry out of the number, you must show that design would not predict the pattern — and that step is usually assumed rather than argued.

3. Shared genes would indict common design too. A large fraction of human genes have counterparts in mice, and many in fruit flies and yeast. If percentage of shared sequence settles ancestry, the argument settles far more than it intends. Consistency would require us to be mice, which is precisely the reductio the objection walks into.

4. The differences are not trivial. Gene regulation differs substantially, and so does the architecture and timing of brain development. Which genes are switched on, when, and how strongly is where much of the functional gap lives. A small percentage of sequence can carry large consequences, which is why the percentage alone is a poor argument.

5. Reuse is what designers do. Engineers reuse components across product lines because it works. Biology runs on a modular toolkit — the same genes, the same regulatory logic, the same body plan — and common design predicts common parts without embarrassment. Shared architecture is a prediction of design, not a problem for it.

6. Scripture is about image, not percentage. The biblical claim is that humans are made “in the image of God” (Genesis 1:26–27), which is a claim about nature, dignity, and calling rather than about sequence. David's “fearfully and wonderfully made” (Psalm 139:14) is not a statement about nucleotides. Nothing in that claim rises or falls with a homology statistic.

7. Christians genuinely disagree here. Some accept common descent as the means God used, as BioLogos argues; others, including Stephen Meyer and Michael Behe, contend the evidence points to design instead. This is a live dispute among informed believers, and pretending otherwise would be dishonest. What both sides deny is that the percentage by itself settles the metaphysics.

8. The objection confuses mechanism with meaning. Even if common descent were granted, it would answer a question about biological history and leave untouched the questions of why there is something rather than nothing, why the universe is intelligible, and why humans alone ask such questions. Acts 17:26 says God “made from one man every nation of mankind,” which is a claim about human unity, not about a gene count.

98.6% is a real measurement with a narrower scope than the slogan implies, and it is compatible with more than one account of origins. The interesting question is not whether we resemble chimpanzees, but what kind of thing a creature is that can measure the resemblance and ask what it means.

Sources: Stephen Meyer; Michael Behe; Signature in the Cell; Darwin's Doubt.

Related challenges:
• Doesn’t evolution account for the origin and diversity of life on earth, thereby eliminating the need to appeal to God?
• Doesn’t the fossil evidence support the theory of evolution?
• What about vestigial organs like the appendix, or the gill-slits in fetuses? CERTAINLY you can’t mean to suggest that that makes more sense given theism than evolution, can you?!