Best arguments against Christianity?

[Raven]

What are some of your favorite arguments against Christianity in general? I enjoy using philosophical/logical arguments, but I’m looking to expand my arsenal of topics I can use. One topic I find particularly interesting argues the invalidity of Christianity based on the fact that Christian writings stole so many things from previous religious traditions. This article summarizes the argument well:
http://see_the_truth.webs.com/Old%20Testament.html
Does anyone else have any topics they’d recommend bringing up while debating? I’m fairly good at arguing from a philosophical stance, or a moral one, but like I said, I want to become more diverse in my approach. Thanks!

[Smellyoldgit]

I much prefer the "Fuck Off, you're full of shit, don't waste my time you cumchugging cunt" approach. Not really an argument, but one doesn't have to listen to much of their bullshit after the initial salvos.

[Kinich Ahau]

Welcome Raven.

[Kinich Ahau]

Best arguments against Christianity? Answer: Christianity.

or point to the lack of evidence for Jesus actually existing. They really really hate that.

and then to Smelly's method.

[Sinfidel]

"Debating" the religious is a waste of time. They just want to preach, and your responses will be ignored. They cannot debate because they have ZERO evidence to support their position, and thus respond with fallacies, personal insults, and lies. Most Atheist Authors have stopped debating them, because you cannot win a debate with a liar.
There is a wealth of sarcastic comics, posters, pictures on the Web. Much easier to click on one of those and paste it in response, rather than waste time and energy writing what will likely be ignored.
More fun too!

[Davin]

Best argument? Mine goes something like this, "you think there's a god, what have you got then?"

[Sinfidel]