National Day of Prayer

I agree with the Freedom From Religion Foundation, whose lawsuit was successful at the district court level before losing on standing, that this is unconstitutional. (Link to litigation at that linked discussion.) Good luck doing so these days.

The President shall issue each year a proclamation designating the first Thursday in May as a National Day of Prayer on which the people of the United States may turn to God in prayer and meditation at churches, in groups, and as individuals.

Congress should not be selectively advising people, especially the president [though this one is quite willing to do so without being pushed], to pray. The district court opinion from the before times referenced Justice Blackmun's opinion in a creche case (Allegheny):

It is worth noting that just because Marsh sustained the validity of legislative prayer, it does not necessarily follow that practices like proclaiming a National Day of Prayer are constitutional. Legislative prayer does not urge citizens to engage in religious practices, and on that basis could well be distinguishable from an exhortation from government to the people that they engage in religious conduct. But, as this practice is not before us, we express no judgment about its constitutionality.

The dissent acknowledged that the legislation “is a straightforward endorsement of the concept of turning to God in prayer." [cleaned up] These days, that sort of thing is more and more allowed. It still is bad under the First Amendment.

The word "may" aside, the legislation has the purpose and effect of promoting prayer. It is a "National Day of Prayer." Baptists who respect the separation of church and state see the problem while realizing there are worse breaches.

(There is a reference to meditation, but it remains a day of prayer. And not everyone does that either.) 

I again note that -- though prayer is something many religions do -- the language favors Christianity. There is a reference to "churches," not places of worship. 

Religious liberty warrants a separation of church and state. It also warrants avoiding favoritism, including selectively instructing the president to proclaim about certain religious activities.