It looks like his mind is shut. It could well be that, to him, seeing as he is the older and wiser one, your father, he sees you as some arrogant, know-it-all upstart. That's why knowing when to back off or yield, allowing him to think he's teaching you and asking him pertinent, insightful questions may be the best approach with him.
Bizzarely he claimed that the worlds most famous athiest accepts the existence of god (he didn't say who) which is a bit weird.
That would be the late Antony Flew.
he then said that no one has ever been able to tell him what the evidence for evolution is and asked me to explain, in my own words. what the proof is that life started without intelligent design.
It sounds like he's making the common mistake of conflating evolution (the explanation of why life on earth is so diverse) with abiogenesis (where/how life originated). Click on this link.
should I bite?
Only if you really know your stuff and can simplify it sufficiently so that one or two key points stick. Perhaps explore how JWs accept microevolution which involves the same processes as macroevolution but in a far reduced timescale? Just an idea.