One thing that never fails to make me sigh with frustration is the so-called moral argument for the existence of God. I can deal dispassionately with the argument itself, but what wears me down is the prevalent theistic assumption that whatever atheists may claim about the origin of their morals, morality is irrevocably woven into God's nature, and atheists are therefore merely borrowing morality from the deity. This is bunk, but it's such an ingrained assumption that the mechanism of it is adopted throughout theism, with a version of it even evident in presuppositional apologetics.
I've grown tired of explaining that human morality is an evolved attribute (and anyway it seems many theists just can't get it), so from now on I'm happy to leave the explication to QualiaSoup:
Subscribe to QualiaSoup's YouTube channel for subsequent instalments of what will no doubt be an excellent educational series.