That being said, I can see how the term might seem intimidating or off-putting to someone unfamiliar with the concept. And so I think it's worthwhile to offer a quick and dirty basic description of what spiritual impurity is and how you avoid it.
Part of it also is people don't, because of their backgrounds, want to exclude anyone or anything -- because they've been excluded. Consequently they are tolerant and permissive to a fault. We saw this with the Kenny Klein thing. They didn't want to exclude him, made excuses for him because in the past their own feelings had been hurt and now they didn't want themselves to seem bigoted or judgmental. I'm sorry though: some things one needs to be judgmental about, and in Kenny Klein's case child abuse fits the bill. So i think we're seeing multiple threads coming together here to create a storm of antagonism and purposeful misunderstanding. It doesn't help that 'purity' is a very loaded term in monotheism, one that is often used to attack women's sexuality and behavior. This definition of purity has absolutely nothing to do with miasma.
Then again, the cynic in me wants to point out that if we really took miasma seriously as a community, if we were really each doing the requisite cleansings that our Gods and ancestors required, that we felt we needed to do in order to maintain good discernment and good integrity of being before the Gods and spirits, maybe we'd see through some of the bullshit currently being spread throughout our communities.
GK: What angers me the most about atheist incursions is summed up in an encounter I had awhile back that I wrote about here. In that piece, I talk about an encounter that I had a local shop. An atheist was talking about how he was Heathen, but only because he liked to hang out with his dudebros and drink, and he thought the Viking ethics were good to live by. I challenged him, on his appropriation of our religion and he said "well, it's not a religion to me so it doesn't matter." The extreme self-centeredness is, I think particularly enlightening. There is zero respect for the religion, the tradition, or the people and communities practicing it. Moreover these people come in and expect us to lower our standards to their level, to accommodate them in their impiety and ignorance. Our traditions are viewed as something for them to use and enjoy, as something disposable, and they do not care about the hurt and harm that they are doing. They do not care about the damage they may cause. It's all about them, and making sure that no one else can have anything deeper and more significant than the experiences they will allow themselves. It's holding not just spiritual mediocrity and shallowness, but spiritual absence up as a life goal. There is a contempt for the Gods because they will not humble themselves to acknowledge that something greater than they themselves exists. And because they won't, they cannot stand that others do and reap the not insignificant benefits of piety. They can't even have a live and let live philosophy, and note they only ever come into our communities demanding that, we never go into theirs demanding that they acknowledge the Gods and change their atheist beliefs.
I agree with you: this must of necessity be our hard line: there is no room in our traditions for people who refuse to treat our beliefs with respect and who refuse to bend their knees before the Gods. No room at all and we need to hold the line against this pollution.