If left solely to each state to decide, say, if they're going to say grace before eating in the cafeteria. Now, if that school is funded by state taxes that are derived from the people of that state then this is unethical and infringes upon the rights of those that are not religious. OTOH, if that school is privately owned, they can do whatever the hell they want. In the first case the church is meddling in the state business. In the second case, the state does not apply so anything goes.
By "pockets", I was referring to a group or community that sees no problem requiring all students say grace before eating their lunches. As they say, one thing leads to another. Within time this "behaviour" will become dominant and the standard.
Scenario: An aethiest family moves to this community unbeknownst to thier fate and is ostricized by the community for their beleifs. Now you have the exact same situation the Puritans left England for.
Insight.