I tend to look down on wiccans more than I do other religious types (or at the least, just as much).
Don't get me wrong, I think all belief in a religious or spiritual world of whatever sort is ridiculous and that such ideas are nonsense, but at least when it comes to the christians and such, it can be more of a passive thing where at most, they expect god to be guiding their lives behind the scenes or something, not directly giving them shit wishmaster style. And since no direct interaction is required, the belief can persist based on nothing.
For Wiccans however, my only experience with one has informed me that magical spells and potions are treated as real things, and unless I was misinformed, that's beyond laughable. Not only is it just as silly as the belief in say, heaven, but it's not passive. It's not simply sitting back and accepting that something will happen that can't be proven nor disproven while you still live, I can't even begin to understand the level of self-delusion required for someone to "cast a spell" and actually believe they accomplished something.
Edit: On second that, I suppose other religious types can be just as bad. As someone above pointed out, believing in magic isn't much different than praying. Casting a spell is rather similar to praying, and in either case actually expecting something to happen as a result is insane.
Edit Edit: Correction, expecting something to happen is just stupid, deluding yourself into believing that something did indeed happen is the insane part.