The current topic is dangerously philosophical, but it's not something I hear discussed often so I think we're treading non-circular ground for once.
Ethics of belief is only tangentially related to religion, yeah. As for Max W's thing, I think the major reason we've currently mostly subscribed to a kind of "anything-goes" in the realm of belief is because that's been the system that's so-far been least capable (though, of course, note that least is not
un-) of being abused, or at very least is the least troublesome to roll with. If you hold that there's reasons to disallow certain sorts of belief systems, things get
hellaciously complicated.
There's a number of folks that have chimed in on the ethics of forming and holding belief, though, most of them outside of theology so far as I know.
It's fine to think whatever you want. It's when you start pushing your beliefs on others that the problems start. Also, who said your beleif isn't going to be criticized? If you have the freedom to voice your beleif, other people have the right to voice your beleif that their beleif is wrong.
See, there's a problem with this thought: Numerous times in judeo-christian-Mosaic-based scripture, (all the Bibles, the Torah, and the Qu'ran), it states clearly that people are to go and spread their beliefs. If you don't, you're disobeying your religion, and risking eternal punishment.
The
method of spreading your belief can vary, though. It's not all shoving bibles down your throat and hellfire and brimstone and swords. I've ran into a few Christian believers who hold that proselytizing is done
strictly through action (or to be more precise, it's a necessary
consequence of proper worship; "walk with god and others will come and walk with you", kind of thing), and who only spread the word, so to speak, when it's directly requested and even then not as a "this is the truth" but a "this is the truth that has worked for me" thing. I'm fairly sure there's a bit stronger thread of that in some of the more predominately eastern religions, as well.