Yep, that is why the only words you can't say on a state owned microphone are Jesus Christ. And the only words forbidden in public schools, Jesus Christ. Meanwhile, promotion of teenage sex, homosexuality and abortions is the norm. Yep, a lot of politicians give lip service, but few of them really mean it.
While I understand those are popular urban legends, those statements just don't hold any water.
You can't use a state owned microphone, or a school, to proselytize. That's good. I don't want my local school used to promote Methodism any more than I want the government to have any say in what's in the sermon at my local Methodist church.
You know why it's considered ok to poke fun at Christians? Because they are a hugely powerful majority that dominates a great deal of the government. That's why it happens, and that's why its good that it happens. The powerful should be the target of some mockery. That's good for our system, and it's ultimately good for the church itself.