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The slippery slope argument is a logical fallacy that is used to inflame fear. It's not a valid argument, but is used in debate to draw conclusions that are not justifiable.
In a recent LA Times column, a pro-prop8 columnist argued that gay marriage was Just the Beginning and something Far Worse would occur, something like the End of Religion.
Excuse me?
That's entirely bogus. This has nothing to do with attacks on religion (indeed, lots of opponents of prop8 are religious from ALL traditions). Gay marriage has nothing to do with church rights (see Argument 4), education of children (see Argument 3), nothing to do with polygamy, bestiality, or pedophilia. (interesting that the anti-interracial marriage folks years ago brought up the polygamy canard too, don't you think?)
Prop8 is about one thing only: whether gay people have the right to marry the person they love, with all the responsibilities and expectations thereof.
Interestingly, at a recent rally, pro-Prop 8 folks were telling gay rights supporters on the edge of the crowd to vote "yes" to support gay marriage. The correct answer is VOTE NO: a "yes" vote puts bigotry in the Constitution.