Jason Kuznicki rephrases his argument:
The fear of slippery slopes is not the fear of a legislative or judicial process leading by its own wicked logic to the abandonment of common sense. It’s the fear of cultural change. Or rather, the fear that the future will not always agree with you. Less charitably, it’s the fear that you might just be plumb wrong on a lot of things that you would find highly embarrassing to reconsider.
Working in the neighboring territory, Mark Thompson says there is no reason that religious liberty and marriage equality can't co-exist:
[T]he conflict here is definitively not between gay marriage and religious liberty. It is instead between laws regarding private discrimination and freedom of association, or perhaps between licensing laws and freedom of religion. As they affect the private sphere and specifically religious organizations, gay rights, and specifically same-sex marriage, represent at most an expansion of existing conflicts rather than any new type of conflict. Even here, the conflict arises not from whether or not same-sex marriage is permitted, but instead from whether or not statutory laws recognize sexual orientation as an impermissible basis for private discrimination (whether in an employment context, public accommodations context, or otherwise), which is independent of whether same-sex marriage is permitted.