I keep hearing theists argue that there is a god because of design, or morality, or how it 'feels right'. From there, of course, they're happy to say how this god is a Christian, or Muslim, Jewish, etc (ya, ya, they're the same, I know).
However, I can't understand how ANY theist argument proves the existance of ONE god. Every one of their arguments could just as easily describe many gods (a sun-making god, a planet-making god, black hole god, etc.).
From now on, I think I'll start challenging theists with this:
Without using a holy book, give evidence that it's impossible for 2 or more gods to exist.