"guaranteed to happen" and other slang phrases
I didn't know that was a slang phrase to begin with. I guess that's why this search turned up only four sites, none of which treat this phrase as slang.
muslims say they believe in the same religion as Christians
No, they don't. They say there's only one God, and they say Christians believe in three. They say Muhammad is his prophet, and they know full well that Christians don't believe that. Their basic confession of faith consists of those two things, both of which they see as distinguishing them from Christians. It's liberal Christians who think the religions are the same. Muslims are under no such illusion.
Girls = Evil fallacy
Yes, someone actually wants some written support for the thesis that girls are not equivalent with evil. Of course, girls are evil. We all are, but that doesn't mean girls are equivalent with evil. 'Girls are evil' is only true if you're using the attributive sense of the verb 'to be'.