Judges are wholly incapable (and Constitutionally prohibited) of determining religious issues.
The mere fear of being charged with blasphemy would stifle speech. Advocacy groups for various interests would use your laws to pretty much shut down politically incorrect speech.
I agree that this society is sick and no rational lawmaking is possible in it. Yes, advocacy groups for the militant left play it like a fiddle. I am yet to see a Christian interest upheld in any measure by today's courts. If I saw anti-Christian speech being stifled on the grounds of blasphemy, -- or really on any grounds, -- I'd share your concerns.