Sometimes it is what evolution hasn't done that makes me doubt it. The main one is this:
If evolution is a force capable of the incredible feats that are claimed, able to produce the incredible spectrum of life forms we see, why has it been unable to make any progress in eliminating the programmed death or limited lifespan built into animal life.
There is no technical reason for such limited lifespans and wouldn't a longer lifespan be an incredible evolutionary advantage? This would seem to be the most obvious progression for evolution to take if it is the unguided process that is claimed.
Evolutionists can come up with a plausible explaination (like that would cause overcrowding and resource limitation) but there are many other possible solutions to that problem. Somewhere along the line, evolution should have come up with longer life spans if not immortality. Life AND Death appears to be 'by design'.