The whole purpose of establishing governments is to protect the citizens in a society from each other. That means those citizens will determine what each individual's rights and responsibilities are, and the government will enforce them.
The fact that you don't like the state telling you what you can and cannot do to other people in the name of your religion (or for any other reason), and the fact that you are unwilling to acknowledge that the state, in a representative democracy, is an authorized extension of the will of the people you live among and that formed it, and operate it, just shows your own excessive level of immaturity and selfishness.
The state is not involved in religion in any way. But it is involved in establishing and protecting the rights and responsibilities of it's citizens. And when religious factions seek to abuse those rights and responsibilities, it's the government's responsibility to stop them.
Right up until they abuse the rights of others, and ignore their responsibilities to their fellow citizens. Then the state is obliged, and MANDATED, to step in and stop that "expression of religion".
The government has an absolute right to intrude. That's WHY it exists.
the problem as I see it is this: while I absolutely agree with the words you wrote here...that is, the government has the right to keep religions from messing with the rights of other people, i know that this isn't what most people who spout this stuff MEAN when they say it.
What they mean is this: the government has the right to see to it that politically incorrect beliefs cannot practice their beliefs, and that the politically correct have the right to enforce THEIR ideologies and agendas upon the politically incorrect. That seems to be true no matter what is considered to be 'politically correct' at any specific moment.
For instance: there was a time when it was considered VERY politically correct for the slave owners of an area to declare that the members of a certain religion be forced all the way out of the USA because polygamy was politically incorrect. Those people were forced out and the slave owners won, because the 'government had the right."
Now it is politically correct to be gay and get married. I have no problem with that myself, actually (I did...but my problem wasn't THEM getting married, it was what they wanted to force US to do, and still is). It is NOT politically correct to believe that gay marriage isn't religiously correct; therefore it is perfectly acceptable to force the politically incorrect to participate in the ceremonies of the politically correct.
It is politically correct to believe in freedom FROM religion, and politically incorrect to display one's religious beliefs in public. So...it is perfectly acceptable for the government to take over a parade that was established and funded by a local Christian church and declare that there would be NO religious floats/displays in it, even though that 'Christmas Parade" was over a hundred years old....and the city still insisted that the church pay for the whole thing if it were to occur.
It is politically correct to believe that one should be able to walk down the street and not be exposed to any religious displays....and politically incorrect for any Christian displays to be shown for the Christmas holidays. Anywhere. A woman here in my area was sued by the local chapter of AA for putting up a cross on her lawn because it could be seen from the freeway.
You need to figure out that if YOU have the right to express and enforce your lack of belief...or simply different beliefs, you are just as 'bad' a 'religion' as anything you are against.