1. You are trying to reframe the argument to be more favorable for your position. "How to do X" is related but different question from "Should X be done".
2. I think political affiliation as a protected status would be sufficient. If Nazi want such protection they could form a party and all register as card-carrying members. I disagree with your "requirement to maintain protection", as it can be easily abused to negate such protection. Let me demonstrate: democrats advocate for reproductive rights, this discriminates against religions that believe it is forbidden.
3. It isn't. Since you assert so, it is up to you to prove your point.

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