Have you checked to see when those Blue Laws were put into effect? The laws regulating what can be done on Sundays are outdated at best. I mean, hell, they even outdate the signing of the Declaration of Independence by a little more than a century! And that's just for Connecticut. In other states car dealerships are/were forced to be closed, etc. However the trend is that these laws are being amended or removed entirely as their significance reduces. These laws were generally put into place prior to an official separation of church and state.
*Unable to access third link. It's not loading at all for some reason. Study done in New England requires credentials and/or a fee.
First study doesn't present data on how strongly the subjects identify with atheism. Without knowing how strongly they feel about and believe themselves to be atheist, how can anyone know whether they are or if it's something that they still are deciding for themselves. People's reactions can be different based on on this. This study also shows that these atheists weren't completely out about their disbelief (on average). Out of the ten possible relations that they could be out about their atheism to, the average was just below 6. It's possible that the perceived discrimination was due to an ignorance on the discriminator's part for not knowing the person was actually atheist.
On page 54 it gives a table of the types of perceived discrimination experienced by atheists in the study separated into groups of Social Ostracism, Coercion, Slander, Denial of Opportunities, Hate Crimes, and Other. Under Social Ostracism, it seems to be the extreme minority of the atheists who feel outcast because of their being atheist. Of these, the most they have felt discriminated is because of classmates or coworkers. Even then, less than 30% felt they were discriminated on more than one occasion.
For Coercion, the highest amount of perceived discrimination is under "Being expected to participate in religious prayers against my will" with "Being asked to attend religious services or participate in religious activities (besides prayer) against my will". In regards to the prayer, isn't it possible that they are being asked to say grace with the rest of their family at dinner or during the holidays? And as for participation in religious activities, it's likely that they have been asked during the holiday seasons that are big within the religious community (ie Christmas and Easter). These are also the times when you see a large rise in the number of people filling the churches.
Under Slander is where you find the largest amount of perceived discrimination. Of this, the majority is under "Witnessing anti-atheist comments in newspapers or on television". My problem with this is that television makes fun of all religions, beliefs, actions, etc. Atheism isn't the only thing that is shown in a negative light on the tube.
Almost no one said that they were denied opportunities based on their atheism and of those who did, it was generally between 1 and 3 times that it happened with a few outliers in the 4+.
Again, little to no hate crimes because of their atheism.
In the Other category, I can understand the "Being unfairly stereotyped because of my Atheism" and Being treated differently because of my Atheism" sections. Many people do both of these. However, as with actual religions, or other dividing things like race, gender, age, etc, people are going to stereotype and treat people differently based on those stereotypes. It's just a fact of the world.
The second study doesn't correlate the levels of discrimination that those who are religious (in the national sample) experience discrimination. It would have been a bit more productive for them to relate how many of the atheists or non-religious are discriminated against those who hold religious beliefs or belief in a deity/deities. What I do like about this survey, though, is that it makes a distinction between non-religious and atheists. Despite the arguments I've been putting in this thread, I don't believe atheists to be religious, merely that the definition we use to describe religion would make atheism included.