Evolution explains design without a designer.
The objection, in full
Paley's watch was the strongest pre-Darwinian argument. Darwin disposed of it. Random mutation plus non-random selection produces the appearance of design from below. We don't need a designer for the eye, the hand, or the human.
Biology is the study of complicated things that give the appearance of having been designed for a purpose.
or, in plain terms —Evolution killed God.
Evolution is a description, not an explanation.
If evolution simply means that a positive thing called an ape turned slowly into a positive thing called a man, then it is stingless for the most orthodox; for a personal God might just as well do things slowly as quickly.
But if it means that there is no such thing as an ape or a man — only an endless smudge of becoming — it is a much more daring dogma than any of the Creeds.
I have noticed that men who say evolution makes God unnecessary tend to mean evolution makes morality unnecessary. They have left the door open behind them.