Ad homs like this are not helpful in the debate. Instead we should try to help him to overcome his deadlock with evolution. If someone feels his worldview questioned the existentialist fears that arise from
that threat make people respond more emotional than intellectual. Thus we should help them to overcome that fear.
The problem I see with the teaching of evolution is that it is used by the religiophobes to argue God to be obsolete by having found an alternative explanation for human existence. This is not part of teaching evolution but of teaching atheism. Once one understands that Evolution is not a random process but the slow unfolding of a plan - as implied in the word - it is easier instead of rejecting it to look for a better explanation of the process.
The big confusion created by Darwin was the comment of “survival of the fittest” which let people confuse fitness with physical strength. To claim it to be adaptability to outwit others to starve them of their food sounds equally cruel thus makes it unacceptable for those believing in a loving God caring for his creation and being just. It is only when you understand the rule by which evolution is controlled that you can see where a just and loving God is in control of the process. Once you understand that the selection is not based on “survival fitness” but on the judgement by the system authority (as not to use the term God to put the existentialist fear into the religiophobics) if they are capable to love thy neighbour like thyself, e.g. are not selfish but care for others thus stabilise the system (to avoid the red towel word creation) life with evolution becomes easier.
Now on atheist websites my comment that all laws are based on the ability to love thy neighbour as any system is stabilised by this rather simple function I get usually accused of nonsensical drivel. However in the case of evolution this is perhaps becoming more acceptable thanks to the mathematics of game theory. I admit it does not look obvious to most as complex math rarely is, but that evolution punishes selfishness is by now established game theory
or as Nature puts it:
Extortion subdues human players but is finally punished in the prisoner’s dilemma
e.g. love rules.
Now let’s tell that to the rocks and be surprised to find that even they know