How to easily defeat any argument for God

[Belacqua]

It's a bit misleading though, because organs haven't evolved in order to do anything specific. They have evolved as a result of being advantageous (or being associated with advantageous traits) within a certain environment, thus favored by natural selection.

It's true that organs evolved because they were advantageous, with no intelligent design behind them. That doesn't mean that there is no teleology. 

I think that maybe people assume that teleology, final causes, etc., always demand some kind of advanced planning, but that's not the way the term works, I don't think.

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Edited to add:

Maybe I shouldn't start this argument up again, as it might take us off topic.

The point I wanted to make earlier was just: little kids ask "what's it FOR?" without being indoctrinated.